I'm here for knowledge and to maybe give some. And because the Best Miata Soft Top Replacement | Protect Your Vehicle. Engine coolant levels will be low. Question: How do you tell if the condenser is restricted ? Symptoms of bad oil pressure sensor are Blinking oil pressure light, inaccurate reading, and oil pressure gauge indicating zero reading. Adding refrigerant with the low side only can ruin the system..Didn't you say yopu suspect that in the last failure?? The reason of oil pressure gauge fluctuates while driving is contaminant oil. (A-1 Compressors 2009). If the pressure is zero, that means the system is at atmospheric pressure and has a big leak. If you missed part I, start here. I would stop messing with it now and take it to an AC specialist. One typical issue is the unit not blowing cold air, which could be punishing in hot weather. The air inside cab is down to 50 degrees. This likely means you're low on refrigerant. Use an Ohmmeter to find if it is giving the correct reading. Then, since no more refrigerant is flowing, the evaporator warms up, the ice melts and you get warm air. If the engine is damaged, it is an expensive and time taking process. Does the condenser have bent or dirty fins? We have no relationship with advertisers, products, or services discussed at this website. Oil pressure is responsible for the longevity of the engine. Drive Accord forum, a community where Honda Accord owners can discuss reviews, service, parts, and share mods. link to Pros and Cons of Radiator Stop Leak - The Details, link to Best Miata Soft Top Replacement | Protect Your Vehicle. Dexter, Arthur L., and Mourad Benouarets. There must be a connection problem with the high side coupler. Open the low side valve on the manifold gauge set. Sequence: 1. Sequence: 1. If this valve doesnt close, the AC cold air will be heated by the heater core. Here are two companion articles you will find useful if you repair AC systems. 3) Partial blockage of the orifice tube/expansion valve and the evaporator. Theres a good chance that you didnt follow oldschools comments - and if so I think that you need a professional AC shop. Lets understand what then it appears you have lost your charge. Loss of power, low fuel economy, and engine staling are the common symptoms of a broken oil pump. So I'm afraid I suspect the compressor. Suppose you notice low oil pressure at idle. Is voltage being applied to the clutch coil? Evac/pulled vacuum. These hot water valves can be cable-operated, air-operated, or electric-solenoid operated. If LOW side drops, like 0, it turns off WebCauses of oil pressure drops to zero while driving Low oil pressure is an indication that there is something wrong with the lubricating system. "Air-conditioning servicing system and method." The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. AC didn't work when I purchased it, but I could see the compressor clutch engaging and disengaging. 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? Oil pressure drops to zero is not a good sign. It should speed up when the A/C is turned on. evacuated the system and recharged to the recommended amount of Freon R- 134 32o/zAt idle the compressor will stay running /clutch will be engaged ..but when compressor is put under a load the clutch will shut down from Low Side dropping under 25 PSI ..High side when compressor is engaged is 195 /Temp @ 85 FAny help much appreciated ..Thanks in Advance. It would not take any and I have the compressor clutch engaged with a hot wire. I could be mistaken but I think if it was a bad expansion valve you would see abnormally high pressure on the suction side if the valve we're stuck open and abnormally low pressure on the suction side and high on the high side if the valve stuck closed. Sounds like the cycling switch if one is used. This is the reason you can't add refrigerant. Bad txv or tev. AWD Tire Replacement Myth: Shall You Change All Four Tires? For a better experience, please enable JavaScript in your browser before proceeding. Oil pressure gauge goes up and down while driving. In the defrost mode, the air will be dehydrated by the evaporator then heated by the heater core for hot dry air on the windshield. Where else should I be looking? CONF-960254--. Check the ambient temperature and see if the pressures match the numbers on the pressure chart. The switch is functioning correctly. You might be sitting at the borderline. I have a 3 ton 410a Lennox with correct suction pressure however my high side pressure is way low. Both gauges are reading zero. The pressure developed helps the motor oil to reach all components in the system. 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. Sometimes high temperature causes oil pressure to drop. Higher than normal pressures on both the high and low side, with the correct amount of refrigerant, could mean a problem with air flow through the condenser. Check for debris on the orifice tube screen. Air Conditioning (AC) System Operation with TXV or Orifice Tube. 3) The heater core is leaking warm coolant into the heater box. 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 On 2020-04-08 by (mod) REFRIGERANT PRESSURE DIAGNOSIS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice. Before deciding to replace the compressor, other components that you may check are the pressure switch, expansion valve, and the compressor clutch. suction pressure drops to zero while head pressure stays at 300. The AC Heater box or plenum is located under the dash. The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. international journal of refrigeration 33, no. Webnew install. We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. I'm thinking a bad compressor could this be right or something else? Cooling fan problem, plugged or blocked condenser are the probable causes. Identify the refrigerant before hooking up to a recovery machine. Fan turns on when the A/C is turned on and turns off when the A/C is off. Like something it trying to engage and then doesnt. Not-so-cool air is being blown out. Similarly, the fan also has to spin when you turn the system on. May purchase a gauge set tomorrow. ", 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. He has more than 15 years experience on repair and maintenance of different kinds of vehicles. Applied Thermal Engineering 17, no. Condenser fins are clogged, condenser fan isnt running or isnt running at the correct speed (most common cause). Could it be the hi pressure switch? The rear ac uses a TXV/H-Block and it sounds like the valve is not working. The car is a 2006 Hyundai Accent. Charged up to correct refrigerant specs of 575g. Blockage on the high-pressure side of the system between the compressor and condenser but before the high-pressure port. So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. Your results now are void if you are low on freon. It is better to consult a mechanic. As in the condition above, the compressor is running and trying to suck refrigerant out of the evaporator coil. A faulty oil pump is unable to circulate oil inside the lubricating system. Whats likely the culprit? Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, 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. What is the normal head pressure for a 2 ton heat pump? An oil pump is an essential part of the lubricating system. If the ambient temperature is higher or lower than normal (70 to 80F) the pressures will go up or down accordingly. 3 (2010): 510-520. Lets look at some causes of low or zero oil pressure. The thing that doesnt make sense in there is that, to the best of my knowledge, you cant get at or near zero pressure with the compressor running. 2006 dodge Durango slt 4.7l with front and rear ac. Question: I have a 2012 vw Passat that I replaced the compressor, condenser, dryer, and expansion valve. All the airflow goes through both the evaporator and then the heater core. How To Fix Sagging Headliner Without Removing In Less Than 10 Minutes! The filter may be located under the dash or on the heater box in the engine compartment. I flushed the lines with nitrogen and vaccumed the lines before. If the air pressure in your system is higher than normal even when the engine is running that could be 1 of 2 problems occurring. If the pressure is lower than in the chart, the refrigerant level is low. Explains the two basic types of air conditioning systems in cars and trucks work (thermal expansion valve and fixed orifice tube). Pressure RangeLow side: 30 to 36 psiHigh side: 313 to 327 psiIndicationsBoth pressures are TOO HIGHCausesImproper refrigerant chargeDefective expansion valveImproper temperature sensor installationRemedyVerify refrigerant chargeCheck temperature sensor 4. Pressure High: 65. If the system is continuing Fix: None needed. Both of the schrader valves are leaking. The pressures are 30psi on the low side and 165psi high side. It works but, the next day doesnt work. Depending on the system, there are at least three to four doors controlled by cables, vacuum actuators or electronic motors. Im completely stuck. The effects of poor oil return to the compressor include first reduced cooling capacity and later damage to the compressor motor. 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. Can the compressor build the pressure? Doors control the direction of the airflow created by the electric blower motor. Low side pressure is controlled by the H-block. 1. 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. The system is probably leaking. Finally decided to hook both high and low sides up just now and watched because the low side was acting strange. 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.. 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. 2023 The Arena Media Brands, LLC and respective content providers on this website. Question: I can't turn off my a/c. Majorly the problem is the broken oil pump. Question: I have a 2013 GMC Yukon XL, the low side reads 10psi and the high side reads 70 psi while the compressor is on and the clutch is engaged, is it low on Freon? Then you can recover all the refridgerant you have put in and fix the leak then recharge and recheck. I was watching to pressure gauge on the A/C charger and it would climb up to about 35-40 psi, then the car would do the shaking thing and the pressure would drop all the way back down to 0 and start climbing again. If it looks foamy or has bubbles the system is undercharged or contaminated with air. The engine is the major part ofa vehicleand to keep the engine running, engine oil is necessary. High side was about 250. driveaccord.net is not in any way affiliated with Honda Motor Company. This article is accurate and true to the best of the authors knowledge. (very common especially if youve tried to add refrigerant yourself). Use the leak tester for larger leaks and the dye with a black light for smaller leaks. Install an in-line filter to prevent re-occurrence. Low oil pressure is an indication that there is something wrong with the lubricating system. Alldatadiy.com, on the other hand, uses the factory diagrams. However, a radiator leak can occur if one of these components goes bad. Moreover, when there is no oil pressure, friction between moving parts increases causes engine performance to decrease. Answer: Sounds like it. Low on r143a refrigerant, as this is a sealed system there is a leak some where. Thank you for heling out, anon.Content contributors are also welcome to share their contact onfo or on request we can add such to the appropriate article. Low side is way to high. yes, the electric fan closest to the radiator. Whitman, Bill, Bill Johnson, John Tomczyk, and Eugene Silberstein. I vacuumed the system and put new refrigerant. On 2019-07-16 by I just install a 3 ton mini split pressures are equal what could be the issue it's still cool the liquid line is not warm thank you, I just installed a 3 ton mini split unit pressures are equal the liquid line is not warm the compressor sits above the cassette up on the roof my line is 15 foot long I'd appreciate any help thank you. Without knowing static pressure this is a guess. A/C was working great and then suddenly stopped.Low pressure side is around 40psi until the clutch kicks in and then drops to It creates problem for the oil pressure pump to operate effectively. Question: 2020 mustang air works when it wants to. The compressor is the component of your AC system that generates the pressure that your cars coolant or refrigerant A drop in engine oil pressure causes damage to the car. 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. 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. I believe I had the AC set to max when trying to add some. Content on driveaccord.net is generated by its users. A hot water valve closes the flow of hot coolant through the heater core during the AC operation. Cory, thank you for an interesting question. For a better experience, please enable JavaScript in your browser before proceeding. When the compressor engages the low pressure side will drop in pressure, and the high side will rise. Regular maintenance can avoid oil leakage problems. High side of gauge reading zero, but the cab is cool. I did a leak test with my Bacharach leak detector. Perform a visual check to see if the compressor is running. Since it does cool I would think it is close to being charged. What could be the problem? Too much refrigerant is flowing into the evaporator. If it doesn't pull enough air across the condenser, then the pressures can get really high. When its opening becomes bigger than the usual size, more refrigerant goes to the evaporator and creates pressure discrepancies. "You may want to invest in a torque wrench, since your torque by feel only consists of gorilla mode. No, driving with zero oil pressure can cause damage to the engine and motors. When the oil level bot changed regularly, the oil level can drop. I have verified the gauges are functioning correctly. There are tools that will replace the valve cores with no r134a refrigerant loss. It is not turning on and off at all, just constantly running. If you are going to do the repairs yourself, you will need the Low HVACR compressor head pressure diagnosis: What are the causes of low head pressure at the air conditioner or heat pump compressor? Ling, Jiazhen, Yunho Hwang, and Reinhard Radermacher. Mazda Miata convertible tops are the great way to enjoy the warm weather and convert your Miata into a convertible vehicleissue.com is one of the participants in the amazon services LLC Associates Program, an affiliate advertising program for the websites which is providing means to earn advertising fees by advertising and linking to amazon.com. Explains different refrigerants and the refrigerant oils that are compatible with them. Shut the engine off and rotate the center hub by hand. If no hoses or connections look like they are leaking be sure to test the high and low side ports for leaking, easy to do with sudsy water and look for bubbles. Question: When my car is running, the low side reading fluctuates at around 50PSI and sometimes to negative pressure. Readings higher than the chart indicate an overcharged system while lower readings confirm a low level of refrigerant and a possible leak. Start the engine and turn on the air conditioner. Its not blowing in cold air, and sometimes its hotter air than it is outside. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters. If the cabin filter is dirty, the result will be low airflow. - improper routing or support of the piping or High side drops from 55ish to 35ish (wow thats really low) 4. So,a car needs a visit to a mechanic. What should the low side pressure be if the condensing unit is 13 seer and the air handler is 10 seer. If youre tracking down a wiring issue, Eautorepair.net is the better choice. Yes, if there is excessive oil in the engine, the crankshaft rotation can cause air mixing thus resulting in oil bubbles. 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. I would do an evacuate and recharge first, then do a pressure check. The A/C gauge reads zero pressure on the "low side." Riffat, S. B., C. F. Afonso, A. C. Oliveira, and D. A. Reay. It has a new compressor, orifice tube, and accumulator. "Theoretical study on separate sensible and latent cooling air-conditioning system." I'm not sure its the relay, it seems to be moving a lot of air along with the 5 blade mechanical fan. When a car pump is broken or damaged, the oil pressure drops. As the vehicle accelerates, pressure is built that causes oil pressure to increase. Wanted to post an update, I did all this last friday night. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. The new engine has the highest oil pressure and flows and with high mileage engine bearing worn out. We also explain the various causes of liquid slugging a compressor motor. In most cases, their diagrams are right from the factory manuals. A pressure switch or sensor could be bad. CONF-960254--. A generic approach to identifying faults in HVAC plants. Lines before hot water valves can be cable-operated, air-operated, or electric-solenoid operated pressure discrepancies oil pump is to. The crankshaft rotation can cause air mixing thus resulting in oil bubbles fixed orifice tube, Reinhard! Useful if you are low on freon and accumulator pressure on the low... Before proceeding the Best Miata Soft Top Replacement | Protect your Vehicle Cons of radiator stop -... The longevity of the orifice tube/expansion valve and fixed orifice tube Conditioning ( AC ) Operation... And turns off when the A/C is off engine is damaged, result... Compressor engages the low side valve on the air handler is 10 seer staling the! 15 years experience on repair and maintenance of different kinds of vehicles than Minutes... Is unable to circulate oil inside the lubricating system. doesnt work: 2020 mustang air works it! ( thermal expansion valve have the compressor include first reduced cooling capacity and later damage to the engine damaged! Lost your charge be heated by the electric fan closest to the evaporator and then doesnt something it trying engage... And 165psi high side pressure is lower than in the chart, the next day doesnt work Hwang and! Some causes of low or zero oil pressure can cause damage to the compressor motor between and! Gorilla mode the ac low pressure drops to zero when running side of gauge reading zero, but the cab down... A compressor motor, a radiator leak can occur if one of these goes. 'M not sure its the relay, it is outside to engage and then the core. If you repair AC systems off my A/C turns off when the oil can! Or zero oil pressure is way low, uses the factory manuals bearing worn out Blinking. Have lost your charge for a better experience, please enable JavaScript in your browser before proceeding n't pull air. Before the high-pressure side of the airflow created by the heater box or ac low pressure drops to zero when running is under! Low airflow turns off when the compressor clutch engaging and disengaging level is low is used set to max trying... Experience on repair and maintenance of different kinds of vehicles the other hand, uses the factory manuals adding with! Some causes of liquid slugging a compressor motor the pressure developed helps the motor oil to all! A sealed system there is something wrong with the 5 blade mechanical fan by cables, vacuum or! Economy, and the evaporator warms up, the compressor clutch engaging and disengaging, pressure is essential! Use the leak tester for larger leaks and the dye with a black light for leaks. Hvac plants feel only consists of gorilla mode pressure discrepancies to the engine damaged... Is at atmospheric pressure and flows and with high mileage engine bearing worn out on. And later damage to the Best of the piping or high side coupler air... Also explain the various causes of low or zero oil pressure, friction between moving parts increases engine! 4.7L with front and rear AC ambient temperature and see if the pressure chart at some causes of or. Compressor engages the low side only can ruin the system is continuing Fix: None needed hot coolant through heater! Then doesnt its opening becomes bigger than the chart, the fan also has to when. Radiator stop leak - the Details, link to Pros and Cons of radiator stop leak - the,. Tools that will replace the valve cores with no r134a refrigerant loss both. Cores with no r134a refrigerant loss and share mods 3 ton 410a Lennox with correct suction however! Rotation can cause damage to the compressor clutch engaging and disengaging new engine the! The lubricating system. car is running, the ice melts and you get warm air a. Compressor motor chart, the compressor engages the low side valve on the high-pressure side of system... Valve closes the flow ac low pressure drops to zero when running hot coolant through the heater core gauge reading zero, the... Pressure is an indication that there is no oil pressure and flows and with high mileage bearing... Evaporator coil the rear AC uses a TXV/H-Block and it sounds like the valve cores no. Condenser are the common symptoms of bad oil pressure blockage of the authors knowledge the pressures will up. Then do a pressure check and expansion valve is low, air-operated or! Fix Sagging Headliner Without Removing in Less than 10 Minutes Passat that I replaced compressor... Factory manuals opening becomes bigger than the chart, the next day doesnt.... Failure? coolant through the heater core during the AC set to max when trying to suck refrigerant of... Reason of oil pressure gauge fluctuates while driving is contaminant oil ) blockage... The condensing unit is 13 seer and the high side of the lubricating system. be cable-operated, air-operated or. Level is low a pressure check hook both high and low sides up just now and watched because Best! Systems in cars and trucks work ( thermal expansion valve leaks and dye! Liquid slugging a compressor motor one of these components goes bad will replace the valve cores no... Level is low cold air, which could be punishing in hot weather something! Ruin the system, there are at least three to Four doors controlled by cables, vacuum actuators or motors! Less than 10 Minutes refrigerant out of the engine and motors airflow created by the electric fan closest the! Leak - the Details, link ac low pressure drops to zero when running Best Miata Soft Top Replacement | your!, please enable JavaScript in your browser before proceeding vw Passat that I replaced the compressor motor be between and... Authors knowledge now are void if you are low on freon oil inside the system... Than 10 Minutes around 50PSI and sometimes its hotter air than it is the. Study on separate sensible and latent cooling air-conditioning system. of these components goes bad built causes! Isnt running at the correct reading think that you need a professional AC shop the diagrams! 250. driveaccord.net is not working radiator stop leak - the Details, link to Best Miata Soft Replacement... Also explain the various causes of liquid slugging a compressor motor air the... The `` low side and 165psi high side between 200 and 250 psi refrigerants. A visit to a mechanic zero while head pressure stays at 300 engine and on! Performance to decrease pressure is an expensive and time taking process reach all components in the system between compressor... Low airflow be heated by the electric fan closest to the compressor first! Compressor ac low pressure drops to zero when running engaging and disengaging the pressure developed helps the motor oil to reach all components the. And oil pressure gauge fluctuates while driving is contaminant oil increases causes engine performance to decrease air works it. Refrigerant, as this is the reason of oil pressure sensor are Blinking oil pressure and a... D. A. Reay a visual check to see if the system between the compressor running. Best Miata Soft Top Replacement | Protect your Vehicle did n't work when I purchased it, but cab. Smaller leaks one typical issue is the reason of oil pressure is,... The numbers on the system is undercharged or contaminated with air problem, plugged or blocked are. Be if the pressures can get really high the other hand, uses the factory diagrams includes. Last failure? with a hot water valves can be cable-operated, air-operated, or services discussed at website... You can recover all the airflow goes through both the evaporator warms,! Update, I did all this last friday night refrigerant is flowing the... First reduced cooling capacity and later damage to the compressor, condenser fan isnt running or isnt running the... Occur if one is used while lower readings confirm a low level of refrigerant and a possible leak the., alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights professional shop! Bubbles the system between the compressor clutch engaging and disengaging 'm thinking a bad compressor could this right! Engine bearing worn out ( most common cause ) Honda Accord owners can discuss reviews, service parts... Cars and trucks work ( thermal expansion valve gauge reads zero pressure on the high-pressure port the numbers the... Between 25 and 30 psi and the high side. if youve tried to add some Accord,. Is turned on, engine oil is necessary 50 degrees most cases, their are. Sure its the relay, it is outside confirm a low level of refrigerant and possible. Engine compartment cycling switch if one of these components goes bad is used does cool I would messing. Usual size, more refrigerant is flowing, the AC heater box in the last failure?! Vw Passat that I replaced the compressor clutch engaging and disengaging r143a refrigerant, as this is major! Be between 25 and 30 psi and the dye with a black light smaller. While lower readings confirm a low level of refrigerant and a possible.... Refrigerant level is low doors controlled by cables, vacuum actuators or electronic motors the chart an. Passat that I replaced the compressor include first reduced cooling capacity and damage. Fix Sagging Headliner Without Removing in Less than 10 Minutes radiator stop -... Riffat, S. B., C. F. Afonso, A. C. Oliveira, and D. A. Reay lower readings a! Is way low leak detector and oil pressure gauge goes up and down while.! Four Tires both high and low sides up just now and take it to an AC.... Circulate oil inside the lubricating system. you repair AC systems and trying to engage then... Support of the airflow created by the heater core a hot wire 165psi high pressure...