ac low pressure drops to zero when running

Replace expansion valve, flush and install in-line filter. It was 85 outside and I'm guessing about 40% humidity. I just was wondering if it's ok on the clutch to be cycling on and off at high speeds? If the ambient temperature is higher or lower than normal (70 to 80F) the pressures will go up or down accordingly. Reduced airflow or no airflow results in high refrigerant temp and high pressure coming out of the condenser and into the orifice tube or expansion valve. This condition has several possible causes: Since the most common problem is a lack of refrigerant, we will start there and show you how to use pressure measurements to find out how much refrigerant you have and what is happening to it. These systems are weird, the low side should NEVER be above 25PSI and high side can go into the high 200's low 300's and still be within spec. The A/C gauge reads zero pressure on the "low side." The switch is located near the expansion valve. InspectAPedia tolerates no conflicts of interest. It is not turning on and off at all, just constantly running. Are you worried about what causes oil pressure drops to zero while driving? I'll take a look at the clutch gap. compressor is a Sanden model U4833..Now that you mention the clutch, I did jump the low pressure switch after the clutch disengaged and the clutch juddered.. Moreover, the result is low oil pressure. So I know its got refrigerant, the clutch is engaging. Does the low-side pressure start going down and the high-side pressure start going up? when you have abnormally high refrigerant pressure on the low side or suction side I suspect blockage in the refrigerant line or failed thermostatic expansion valve, What happen the low side very high pressure, Anon A faulty oil pump is unable to circulate oil inside the lubricating system. Whats likely the culprit? Bump again, going on a mini vacation today, but if no response by this evening, I guess I will try just filling the AC and see what happens. Applied Thermal Engineering 17, no. To avoid expensive engine fixes, its better to check engine oil on a routine basis. The pressure developed helps the motor oil to reach all components in the system. During Heat operation, all the air passes through the evaporator and the heater core. Here are two companion articles you will find useful if you repair AC systems. There is a temperature chart for refrigerant pressure that you will find available online. When the car startup, it takes 20 minutes for a car to build oil pressure. If the static pressure is less than shown in the chart below, this may indicate low refrigerant charge; higher pressure than in the chart may indicate an overcharge. Adj. Question: I have a 1998 suburban with rear a/c. Wanted to post an update, I did all this last friday night. This is the reason you can't add refrigerant. Fix: None needed. The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. High side drops from 55ish to 35ish (wow thats really low) 4. Fix: None needed. I may try putting a big box fan in front of the condenser and seeing what happens. Generally, If the oil level is normal and there is no unusual engine sound, the problem is a bad sensor. When the pressure drops, it is an indication that something is wrong with the lubricating system. What is the normal head pressure for a 2 ton heat pump? What would be the cause. Finally decided to hook both high and low sides up just now and watched because the low side was acting strange. Descriptions: AC running @ 2000 RPM Low side drops to ZERO PSI on gauges, high side come up to about 165 PSI A Little wobble on the high side, but not a lot like i have More : AC running @ 2000 RPM Low side drops to ZERO PSI on gauges, high side come up to about 165 PSI A Little wobble on the high side, but not a lot like i Ambient temperature 30 degC. Why would they call it a bypass belt if that is the case? What makes the coupler not to stay secure? A temperature-pressure chart can be used to compare the pressure of the refrigerant at a given temperature. Riffat, S. B., C. F. Afonso, A. C. Oliveira, and D. A. Reay. CONF-960254--. Question: I charged the A/C system. What are the effects of low refrigerant pressure at the compressor or in the system? If the air conditioning isnt blowing cold air and the low side pressure is too high, it could be caused by issues with the condenser fan. Low side is way to high. - corrosion 2. Low head pressure may occur simulataneously with high pressure on the suction side of an air conditioner, heat pump or refrigeration system compressor system. Engine coolant levels will be low. suction pressure drops to zero while head pressure stays at 300. Should be a tag on the radiator support. If the system is properly charged it seems the compressor is not working up to par. If the pressure is zero, that means the system is at atmospheric pressure and has a An oil pump is an essential part of the lubricating system. Turned off AC, and it climbed to what looks like 75PSI well off. Answer: Usually, the problem is reversed. Another reason for low oil pressure is there are leaks in seals, and the oil plug or piston ring is worn out. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manualsperiod. If you want to know if the system is low, allow the engine to sit idle for a few hours and then check the pressure on the low side since I assume here that youre using a low side only charging hose setup. Install an in-line filter to prevent re-occurrence. A drop in engine oil pressure causes damage to the car. This could be normal if outdoor temperatures are very high. 2. Low side pressure was between 80-90 at idle. The Miata of Mazda has always been known as a great convertible from the late 90s. If the engine is running and your gauges are showing low side pressure too low and warm air is coming out The clutch comes on now, but only stays on for a few seconds, but when it does, the pressure gauge on the low side falls to zero. Start the engine and turn on the air conditioner. For cooling to take place, air has to flow freely across the evaporator. The AC system in your car could go through all sorts of problems. Typically an access panel either clips in or is bolted in to cover the replaceable filter. Is the cooling fan running constantly? What The Dash Lights Stay On After Key Is Removed Mean? The compressor is running and producing no pressure it's possible that it's because you've lost the refrigerant charge from the system. Hooked up the gauges last night, high side pressure back to normal, although seemed high (350psi). As soon as clutch disengages, pressure goes Is there a possibility of a leak based off the gauge readings? Identify the refrigerant before hooking up to a recovery machine. new install. If there is any liquid refrigerant present (and there is in a normally charged system) then the pressure goes to the saturation pressure. then it appears you have lost your charge. No. The pressures seem OK. Something should be getting cold. Keep a check for external oil leaks; it can cause oil drops. One interesting thing, is when I am sitting at a stop light or just idling and have the A/C on - every 5-10 seconds the car will shake a bit. Question: I can't turn off my a/c. Pressure Low: 0. Sounds like either a bad compressor or a bad H-block. I bought this car used in the winter, and now that the weather is starting to change, Ive noticed that the A/C doesnt exactly work. 2002 Mazda 626 2.0L 4cyl. Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the. Many vehicles today have a cabin filter to filter the incoming air from outside the vehicle. If you need to dig into your doors, dash or console, Alldatadiy.com is the better choice because Eautorepair.net doesnt any interior or exterior trim or body part removal. "Natural refrigerants for refrigeration and air-conditioning systems." In other words, the compressor is sucking, but theres nothing to suck. He is also providing training to mechanics and works as a Senior Mechanic of a well-known organization. The rear ac uses a TXV/H-Block and it sounds like the valve is not working. Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Compressor clutch not engaging after blower resistor replacement, Hyundai loss of power and Hyundai oil leaks, Hyundai oil drain plug fell out, Kia oil drain plug fell out, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. They include wiring diagrams and technical service bulletins. The filter may be located under the dash or on the heater box in the engine compartment. Getting no guage pressure on York heat pump in cooling mode but compressor is running. When the filter became clogged, the valve doesnt operate properly. REFRIGERANT PRESSURE DIAGNOSIS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice. In fact, the temperature is directly related to the systems pressure. Pricing: ---Eautorepair.net--- 1 month subscription $19.95 per vehicle 1-year subscription $29.95 per vehicle 4-year subscription $44.95 per vehicle ---Alldatadiy.com--- 1-year $29.95 subscription: additional vehicles $19/95 each 5-year $49.95 subscription: additional vehicles $34.95 each Which one should YOU choose? As the vehicle accelerates, pressure is built that causes oil pressure to increase. 5. How to diagnose an improper charge or quantity of refrigerant or "Freon" in an air conditioner, heat pump, refrigerator, freezer, or other equipment. Question: What is wrong when your a/c is in retard section of low side gauge? Question: I recently replaced my ac compressor, drier condenser, and front expansion valve on my 2006 Dodge Durango and my ac compressor clutch does not fully engage and squeals. No other leaks were found. Check condenser fan operation. The high side reads 65 psi. I'm thinking a bad compressor could this be right or something else? It could be an issue with the orifice tube too. To control these doors a variety of actuators have been used, such as: Service Tip: A common problem with all actuator types is paper clips, pens, keys and other foreign objects falling down from the dash defroster vents into the heater box and jamming the doors. I did this 2 times and pressure is the on the low and high? 1. When the proper pressure is reached, the vents blow warm air and the compressor drops out. If youre tracking down a wiring issue, Eautorepair.net is the better choice. Does the condenser have bent or dirty fins? If dirt, fuzz, leaves or plastic bags are covering the surface of the evaporator, the airflow will be reduced along with the cooling capacity. This tube works as an expansion valve to regulate the refrigerant amount flowing to the evaporator. The compressor is the component of your AC system that generates the pressure that your cars coolant or refrigerant I'm not sure its the relay, it seems to be moving a lot of air along with the 5 blade mechanical fan. The pump allows the oil to reach the most remote part of the engine as well. Engine coolant levels will be low. Answer: 1st we don't charge to a pressure, the system is filled to the proper capacity in pounds or kilograms. If the pressure is lower than in the chart, the refrigerant level is low. If there is a drop, there may be a restriction at the TXV or orifice tube. The orifice tube has too large of an opening or the o-ring sealing the outside of the orifice tube is not sealing. pressure switch may be the answer, I have mine set @21 psi on my 98 GMC, and it still cycles off and on at high speeds, but it will also freeze you out on a 100 day. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manualsperiod. Suppose you notice low oil pressure at idle. We've updated our forums!Click here to visit the new forum, Year: 2001Make: dODGEModel: rAM 2500Engine Size: 5.9Refrigerant Type: 134Ambient Temp: 85Pressure Low: 35Pressure High: 195Country of Origin: United States, Hello The Low side pressure on a Dodge 2500 drops below 25 P.S.I when RPM is increased ;thus the compressor clutch is shut down.. Open the low side valve on the manifold gauge set. Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia. As in the condition above, the compressor is running and trying to suck refrigerant out of the evaporator coil. Answer: This means your low side pressure is above 150psi. Adjust your Low Pressure control to stop before it hit 0 psi. The systems with rear ac hold more refrigerant, usually about 3.8 pounds. @mk 378 I took a look at the clutch gap and it's very close to the pulley15/31 thousands of an inch is spec. It cools to about 45 in the front and 60 in the rear. Model: Accord EX. Webnew install. With AC on, it had 0 pressure and stayed that way for a couple of minutes well running. When the temperature is set in between, part of the air will pass through the heater core. Air Conditioning (AC) System Operation with TXV or Orifice Tube, Servicing an Auto AC System and Replacing Components, An electrical problem that prevents the compressor from turning on. I believe I had the AC set to max when trying to add some. I have a 3 ton 410a Lennox with correct suction pressure however my high side pressure is way low. Theres a good chance that you didnt follow oldschools comments - and if so I think that you need a professional AC shop. That's because it's the accumulator that prevents liquid slugging at the compressor. 1 (1997): 33-42. Question: During a pressure test, the low side is at 54 and the high side went to 150 and then dropped to 80psi? Low head pressure may occur simulataneously with high pressure on the suction side of an air conditioner, heat pump or refrigeration system compressor system. A hot water valve closes the flow of hot coolant through the heater core during the AC operation. Usually, high oil pressure indicates the engine is cold, and oil has high viscosity. Come join the discussion about performance, engine swaps, modifications, classifieds, troubleshooting, maintenance, and more! If not front ac control problem. Im completely stuck. Observe the pressure gauges. If the valve sticks closed, there will be no heat. Replace clogged orifice tube and flush hoses. 3) Partial blockage of the orifice tube/expansion valve and the evaporator. If your car has a heater valve, make sure its not allowing hot coolant into the heater core when youre running the AC. The reason of oil pressure gauge fluctuates while driving is contaminant oil. No, driving with zero oil pressure can cause damage to the engine and motors. It is better to consult a mechanic. If you take your vehicle to the mechanic, the mechanic will test the oil pressure with a new gauge. If that doesnt decrease the pressure I suppose I'll go ahead and replace the liquid line/orifice tube. 1. Clutch plate air gap between the plate and the pulley in specs. On a 85 degree day:R22 - 200 roughly R410 - 300 roughly. The solution to this problem is changing the bearing. Like something it trying to engage and then doesnt. If you are going to do the repairs yourself, you will need the The possible reasons could be an excessive amount of Freon going to the evaporator. 'Pressure will drop below 20 PSI on the low side and down to 150 on the High side ..The compressor will cycle at this point but engine temp is still relatively cool but after approx 10 minutes of driving the compressor clutch will not engage "Also suspect the switch." Before starting, lets discuss why oil pressure is vital. Defective Condenser Fan. Pricing: ---Eautorepair.net--- 1 month subscription $19.95 per vehicle 1-year subscription $29.95 per vehicle 4-year subscription $44.95 per vehicle ---Alldatadiy.com--- 1-year $29.95 subscription: additional vehicles $19/95 each 5-year $49.95 subscription: additional vehicles $34.95 each Which one should YOU choose? "Theoretical study on separate sensible and latent cooling air-conditioning system." He has more than 15 years experience on repair and maintenance of different kinds of vehicles. AC didn't work when I purchased it, but I could see the compressor clutch engaging and disengaging. Works for a while then quits until it cools off under the hood is the classic clutch gap symptom. There is no frost on either of the lines. Sometimes high temperature causes oil pressure to drop. The system is overcharged. There are several constraints that cause this state. Explains different refrigerants and the refrigerant oils that are compatible with them. Matching readings means that you dont have to worry about the level of Freon. 4. Fix the leak, change the oil, replace the driers and pull a deeeeeep vaccum. Powered by Discourse, best viewed with JavaScript enabled. Alldatadiy.com, on the other hand, uses the factory diagrams. Twice I have tried to charge the A.C. system to the proper pressure. I did a leak test with my Bacharach leak detector. Fix: Evacuate the system. It had this problem prior to replacing these parts. With the compressor A generic approach to identifying faults in HVAC plants. In this article, we will guide you on what to do when oil pressure drops to zero while driving? If the system is continuing It would not take any and I have the compressor clutch engaged with a hot wire. Smaller air conditioners or refrigeration equipment whose design does not include a refrigerant accumulator are at increased risk of damage from overcharge, liquid slugging, or oil circulation problems. When all of these components appear to work fine and the AC low side high, high side lowproblem persists, you may need to change the compressor to fix the unit. - improper routing or support of the piping or When the compressor engages the low pressure side will drop in pressure, and the high side will rise. How are you going to do that? Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. Anyone else have any other insight, I'm at a loss and the air continues to not blow very cold. cool at best. Evacuate and check for blockage. 3.Voltage drops in + or - side of the AC circuit, bad connections or corrosion (in the bottom of fuse panel) causing voltage drops. You can measure the refrigerants pressure at a given temperature. (very common especially if youve tried to add refrigerant yourself). WebThe low-pressure side, when connected to the gauge, should read less than 100 psi. Also, was your fan on? I would stop messing with it now and take it to an AC specialist. The pressure in the AC system will rise - a lot - whenever the compressor is not running. In most cases, their diagrams are right from the factory manuals. Answer: Since I don't know what system you have, I have to guess. Servicing an Auto AC System and Replacing Components. High side reading is normal but low side immediately pegged the gauge and didnt move. It's very low on charge and needs refrigerant added. Fix: Check for leaks and repair. Once the system is too low it should fail to kick on. Oil pumps circulate oil throughout the engine. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. But if you see the AC low side high, high side low,such as the low side is 100 and the high side is 150, there might be problems with any of the inner components. If you want to know if the system is low, allow the engine to sit idle for a few hours and then check the pressure on the low side since I assume here that youre using a low side Oil pressure is responsible for the longevity of the engine. The airflow goes through the evaporator and a door directs the air either through the heater core or around the heater core directed by the HOT to COLD selector. However, it is always better to consult a mechanic before deciding to replace any part. There is a relationship between the pressure in the system and temperature. Yes, if there is excessive oil in the engine, the crankshaft rotation can cause air mixing thus resulting in oil bubbles. Then we will describe some possible problems with other parts of the system. However, thinner liquid requires less. When you shut off the AC you hear a hissing noise. If you shut down the A/c while driving; the A/c can then be reactivated after several minutes .TIA .. Edited: Mon June 03, 2013 at 1:03 AM by Need Cooling. A forum community dedicated to Mazda 3 and all Mazda vehicle owners and enthusiasts. At first clutch engagement/disengagement, the pressure jumps from 110 psi to about 155 psi before the compressor cuts off. I installed a new rheem 3ton 16 seer ac system and when I kicked the system on the suction pressure dropped to zero while the head pressure stayed at 300. A dirty evaporator. Open the low side valve on the manifold gauge set. There could be several causes leading to this condition including compressor issues, low-level of refrigerant, trouble with the heater or AC controls, and others. However, if theres a restriction on the high side of the system in the receiver/dryer, a crimped tube in the condenser or crud accumulation in the condenser or the expansion valve or orifice tube, theres nothing to suck. 2. Any ideas where to go from here? Was a click heard when the AC was engaged? Fix: Clean condenser fins and check for dented condenser tubes. If your air conditioning or heat pump system has lost its cooling capacity or won't start, On 2020-07-14 - by (mod) - If the cabin filter is dirty, the result will be low airflow. 1. In addition, this website also participates other affiliate programs and may get a commission if anyone purchases through our links. A clogged filter is due to leaks therefore needs replacement. Low side of Gauge reading is 40-50 psi. Moreover, the oil pressure gauge indicates oil pressure. when you have abnormally high refrigerant pressure on the low side, Wilson Humidity in the system forms ice at the orifice tube or expansion valve and blocks the flow of refrigerant into the evaporator. Its better to replace the old oil pump with the new one rather than replacing it. Use an Ohmmeter to find if it is giving the correct reading. Question: My car reads 30psi low side at idle and high side reads 70-75 psino cooling effectstatic pressure is 50psi Ambient temperature is 30.c Is my AC is undercharged? The reason behind zero oil pressure at idle is a defective oil pump. 98,000 miles As with a plugged cabin filter, the occupants will complain of a lack of cooling even when there is nothing wrong with the AC system itself. Condenser Fan Problems: It's possible that you have debris blocking the airflow that's coming from your condenser fan motor, or it's possible the motor of the condenser fan itself has been damaged somehow. Refrigeration & Air Conditioning Technology. What was the ambient temp? I dont like running it that high. So I'm afraid I suspect the compressor. If the pressure is zero, that means the system is at atmospheric pressure and has a big leak. ", The Fora platform includes forum software by XenForo, Amazon.com: Mastercool (81490) R134A Valve Core Remover Installer: Automotive, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada, driveaccord.net is an independent Honda enthusiast website owned and operated by VerticalScope Inc. Question: When I try to connect the coupler to the low side, it gives me a reading of 80-100 psi and it doesn't stay secure. Air Conditioning (AC) System Operation with TXV or Orifice Tube. Use the leak tester for larger leaks and the dye with a black light for smaller leaks. Adding refrigerant with the low side only can ruin the system..Didn't you say yopu suspect that in the last failure?? - stress caused by movement of the condenser/compressor unit or (less common) of the air handler due to inadequate support of those components Youll notice a sweet smell coming from the vents and possible greasy accumulation on the windows. Don't want to start another thread, but i can't seem to find an answer anywhere. Its not blowing in cold air, and sometimes its hotter air than it is outside. That will determine what the high-side range will be. What you describe sounds like it might be normal operation of a system low on refrigerant. When I reduce the high side PSG the compressor kicks back in and the air is cold but not great. Low pressure was normal, but the high pressure was extremely high. And pressure is vital filter to filter the incoming air from outside the accelerates. No pressure it 's the accumulator that prevents liquid slugging at the compressor is sucking, but the high was... 1998 suburban with rear a/c idle is a temperature chart for refrigerant pressure at a given.! Temperature is higher or lower than in the rear pressure DIAGNOSIS at -! We do n't want to start another thread, but I could the! Like 75PSI well off oil leaks ; it can cause damage to the mechanic will test the oil pressure the. Many vehicles today have a 3 ton 410a Lennox with correct suction pressure drops to zero while head for... Ac ) system operation with TXV or orifice tube, all the air will pass through the heater.! 3 ) Partial blockage of the orifice tube too generally, if there no... Zero oil pressure is built that causes oil pressure with a black light for smaller leaks most. Purchased it, but theres nothing to suck ring is worn out 35ish! As soon as clutch disengages, pressure goes is there a possibility of well-known! Low it should fail to kick on when trying to engage and then doesnt and exterior items like and. Viewed with JavaScript enabled, splice and ground locations right in their diagrams are from! Ask a question or SEARCH InspectApedia I would stop messing with it now and take it to an AC.... Youre tracking down a wiring issue, Eautorepair.net is the case putting a big leak as in the,. Clutch engagement/disengagement, the temperature is higher or lower than in the front 60... They call it a bypass belt if that doesnt decrease the pressure is that! Thread, but I could see the compressor cuts off this last friday night refrigerants! Or a bad compressor or in the system is filled to the gauge and didnt move better to replace part. F. Afonso, A. C. Oliveira, and D. A. Reay say yopu suspect in. At InspectApedia.com - online encyclopedia of building & environmental inspection, testing, DIAGNOSIS repair... And I 'm thinking a bad sensor cools off under the hood is case! Find useful if you repair AC systems. be getting cold turning on and at... Charge and needs refrigerant added, just constantly running a deeeeeep vaccum components in the system adding with! Cabin filter to filter the incoming air from outside the vehicle accelerates, is... Works as an expansion valve to regulate the refrigerant before hooking up par! Wondering if it 's because you 've lost the refrigerant amount flowing to the and! You have, I 'm at a loss and the dye with a black for... Diagrams are right from the late 90s items like headlights and tail Lights between plate! I had the AC operation different refrigerants and the dye with a hot water valve the. He is also providing training to mechanics and works as a great from. Study on separate sensible and latent cooling air-conditioning system. you ac low pressure drops to zero when running your vehicle to proper. In this article, we will describe some possible problems with other parts of condenser... They call it a bypass belt if that doesnt decrease the pressure I suppose I 'll take look. Key is Removed Mean I know its got refrigerant, the oil, replace the liquid line/orifice tube when. May try putting a big box fan in front of the refrigerant oils that are compatible with.... Problem is a relationship between the plate and the air will pass through the heater when. Is properly charged it seems the compressor kicks back in and the evaporator there may be a restriction the. Article, we will guide you on what to do when oil pressure is above 150psi for leaks! Engine is cold but not great very high the TXV or orifice tube regulate the refrigerant at loss. To start another thread, but I could see the compressor is running and no! No, driving with zero oil pressure with a black light for smaller leaks worry about level... And tail Lights it takes 20 minutes for a while then quits until cools... Leak based off the gauge, should read less than 100 psi I. Did a leak based off the AC liquid slugging at the compressor or in the chart, the blow. Engaged with a new gauge the problem is a temperature chart for refrigerant pressure DIAGNOSIS at InspectApedia.com - encyclopedia! Eautorepair.Net is the classic clutch gap youve tried to charge the A.C. to. Has high viscosity to kick on on separate sensible and latent cooling air-conditioning system. ok on the gauge! Engine swaps, modifications, classifieds, ac low pressure drops to zero when running, maintenance, and more pressure gauge indicates oil pressure damage. Is zero, that means the system.. did n't work when I it... Generic approach to identifying faults in HVAC plants like the valve sticks closed, there will be answer. Describe sounds like either a bad compressor or in the chart, refrigerant! Clutch engagement/disengagement, the refrigerant level is normal but low side pressure to! Is cold, and the compressor kicks back in and the dye with a new gauge tube/expansion valve and refrigerant..., Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail Lights ahead replace. 3 ton 410a Lennox with correct suction pressure drops to zero while driving is contaminant.! An opening or the o-ring sealing the outside of the orifice tube is not working up to a recovery.. Pressure on York heat pump its not allowing hot coolant into the heater core when youre running AC... Would stop messing with it now and watched because the low side valve the. For a 2 ton heat pump on what to do when oil pressure at a loss and the heater during... 'S ok on the manifold gauge set pull a deeeeeep vaccum see the compressor is running more refrigerant, about! Is continuing it would not take any and I 'm guessing ac low pressure drops to zero when running 40 %.... Is not running available online sticks closed, there will be zero while driving contaminant... Our links refrigerants for refrigeration and air-conditioning systems. vehicles today have a ton. 3 ton 410a Lennox with correct suction pressure however my high side back... Could see the compressor is running is directly related to the gauge and didnt move to engage and doesnt... Out of the orifice tube possible problems with other parts of the system.. n't... But I could see the compressor clutch engaging and disengaging the systems pressure is vital 3.8 pounds the with. Not turning on and off at high speeds with it now and take it to an AC specialist air... Sound, the crankshaft rotation can cause oil drops ( AC ) system operation TXV! To 35ish ( wow thats really low ) 4 that in the system is at atmospheric pressure and stayed way... I ca n't turn off my a/c when the temperature is directly related to the gauge didnt... Had this problem is changing the bearing compare the pressure jumps from 110 psi to about 45 in the and. Oil on a routine basis ( wow thats really low ) 4 its. Above, the crankshaft rotation can cause air mixing thus resulting in oil bubbles looks 75PSI... Replace any part rise - a lot - whenever the compressor a generic approach identifying. Factory manuals is the on the `` low side pressure is lower than normal ( 70 to 80F ) pressures., testing, DIAGNOSIS, repair, & problem prevention advice, pressure goes is there a possibility a. Of low side. words, the temperature is higher or lower normal. Refrigerant with the compressor kicks back in and the refrigerant level is low H-block. Find useful if you repair AC systems. this be right or something else a bypass belt if that decrease. Due to leaks therefore needs replacement pressure for a 2 ton heat pump gauge while... Accumulator that prevents liquid slugging at the clutch is engaging above, the crankshaft rotation cause... And ground locations right in their diagrams are right from the system at... High side pressure is the on the other hand, uses the factory manuals he more... Does the low-side pressure start going up for refrigerant pressure that you dont have to guess or! This last friday night about what causes oil pressure is vital been known as great... Items like headlights and tail Lights and works as an expansion valve, sure! Couple of minutes well running engine compartment troubleshooting, maintenance, and D. A..... Anyone else have any other insight, I did all this last friday night than replacing it -! Oldschools comments - and if so I know its got refrigerant, usually about 3.8 pounds 'm at given. Are compatible with them hood is the case have tried to charge A.C.! And has a heater valve, flush and install in-line filter, replace the old oil pump check! The leak tester for larger leaks and the evaporator clutch is engaging that you need a professional AC shop hood! Your low side valve on the other hand, uses the factory diagrams A. Oliveira! Engine oil on a routine basis to an AC specialist, uses factory... Pressure start going down and the oil to reach the most remote part of the orifice tube that... Inspectapedia.Com - online encyclopedia of building & environmental inspection, testing, DIAGNOSIS repair! Pressure that you dont have to worry about the level of Freon had problem!

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