Lower than normal pressures on both the high and low sides, with the correct amount of refrigerant, could mean that there is a problem building pressure in the system or that too much heat is being removed at the condenser. If youre tracking down a wiring issue, Eautorepair.net is the better choice. Im completely stuck. In addition, this website also participates other affiliate programs and may get a commission if anyone purchases through our links. Is that normal? A/C was working great and then suddenly stopped.Low pressure side is around 40psi until the clutch kicks in and then drops to American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., Atlanta, GA (United States), 1996. "Natural refrigerants for refrigeration and air-conditioning systems." 1. This condition usually means there is a restriction in the system or the TXV or orifice tube is blocked or closed. Why would they call it a bypass belt if that is the case? 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. 2. 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 That saves a lot of time because you dont have to refer back to the component locator or circuit locations. If this low air flow can't keep the car cool or warm, the problem may be incorrectly blamed on poor heater or AC performance. Sometimes oil pressure light is on, but the oil level is normal and the engine is also performing as usual. PSI was around 60 off and 0 when on. 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.. "Measure while the compressor is refusing to engage: what are the pressures?' I'm not sure its the relay, it seems to be moving a lot of air along with the 5 blade mechanical fan. Answer: Sounds like it. When the compressor runs the pressure drops - a lot. Depending on the system, there are at least three to four doors controlled by cables, vacuum actuators or electronic motors. Explains how to recharge a system, how to recover refrigerant, and how to replace AC components. Riffat, S. B., C. F. Afonso, A. C. Oliveira, and D. A. Reay. The orifice tube has too large of an opening or the o-ring sealing the outside of the orifice tube is not sealing. Possibility #1 AC low side pressure is Low because the system is undercharged. 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. Oil pressure is responsible for the longevity of the engine. Are you wondering why oil pressure drops and is it a serious problem? The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. It seems to me that the shaking is what happens whenever the compressor kicks on - it produces a sizable load on the motor and the shaking indicates that you probably have other problems w/ how the engine is running (fuel, spark, air). A drop in engine oil pressure causes damage to the car. Refrigerant Type: 134A. The low-side should be near 30 PSI at 90 degrees Fahrenheit or less. As the vehicle accelerates, pressure is built that causes oil pressure to increase. If the sight glass is clear liquid the system is fully charged. I need shims to increase the 'air gap'; where would purchase the shims ? When I switch it off it still blows semi cool air. A clogged filter is due to leaks therefore needs replacement. When the compressor engages the low pressure side will drop in pressure, and the high side will rise. Generally, this is not a good sign, it needs attention. 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. Delmar Thomson Learning, 2009. 1. 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. Low side drops to around 20-25ish. Answer: Since I don't know what system you have, I have to guess. In other words, the evaporator core ices up and stop cooling. Replace the accumulator (orifice tube system) or receiver/dryer (expansion valve system). Question: Car has front and rear AC, the front only blows cold if the rear is on? The high side reads 65 psi. Theres a good chance that you didnt follow oldschools comments - and if so I think that you need a professional AC shop. '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." I'm thinking a bad compressor could this be right or something else? Thats what I was thinking, evac and pull vacuum, then recharge if everything is good. If the oil has impurities, it requires an oil pump to build more pressure. Keep a check for external oil leaks; it can cause oil drops. I'll do that tonight. Too much refrigerant is flowing into the evaporator. If the system is properly charged it seems the compressor is not working up to par. Compressor turns on. Open the low side valve on the manifold gauge set. A clogged filter leads to extended oil and thus result in poor combustion. 98,000 miles (very common especially if youve tried to add refrigerant yourself). As soon as clutch disengages, pressure goes Perform a visual check to see if the compressor is running. The reason of oil pressure gauge fluctuates while driving is contaminant oil. Air Conditioning (AC) System Operation with TXV or Orifice Tube. If the pressure is lower than in the chart, the refrigerant level is low. Is the center hub turning? Webnew install. If dirt, fuzz, leaves or plastic bags are covering the surface of the evaporator, the airflow will be reduced along with the cooling capacity. - defective or mechanically-damaged copper tubing If your car has a heater valve, make sure its not allowing hot coolant into the heater core when youre running the AC. If your air conditioning or heat pump system has lost its cooling capacity or won't start, On 2020-07-14 - by (mod) - Tomczyk, John, "The Professor: Diagnosing Bad HVAC Compressor Valves", ACHR News, October 2013, original source: http://www.achrnews.com/articles/124501-the-professor-diagnosing-bad-hvac-compressor-valves, Tomczyk, John, "The Professor: Restricted TXV Metering Device", ACHR News, January 2011, retrieved 7 Aug 2015, original source: http://www.achrnews.com/articles/116322-the-professor-restricted-txv-metering-device, Tomczyk, John, "The Professor: Low Head Pressure, High Suction Pressure", ACHR News, March 2010, original source: http://www.achrnews.com/articles/115341-the-professor-low-head-pressure-high-suction-pressure, John Tomczyk , "Troubleshooting A Refrigerant Undercharge", ACHR News, January 2006, orignal source: http://www.achrnews.com/articles/96496-troubleshooting-a-refrigerant-undercharge. But the high side is extremely low. Clutch plate air gap between the plate and the pulley in specs. Doors control the direction of the airflow created by the electric blower motor. 4) Blockage on the high-pressure side of the system between the compressor and condenser but before the high-pressure port. High side of gauge reading zero, but the cab is cool. Also, may be slightly low on R134. driveaccord.net is not in any way affiliated with Honda Motor Company. Answer: By the temperature in and out. Pros and Cons of Radiator Stop Leak - The Details. However, theres also the possibility that the system has gotten overcharged with too much refrigerant. Question: How do you tell if the condenser is restricted ? The TXV is stuck open or the thermal bulb is not sensing the temperature correctly. The effects of poor oil return to the compressor include first reduced cooling capacity and later damage to the compressor motor. -------------------------Don't take life seriously Its not permanent. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. When the fan becomes damaged, airflow through the condenser is 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. This likely means you're low on refrigerant. Is there any resistance? Youve checked the temperature pressure chart below and your gauges and the pressures you see are normal, but your AC system isnt cooling properly. Evacuate and check for blockage. Jayanth, Nagaraj. 04-09-2005, 01:47 Question: I have a 2008 Rav4. Question: I can't turn off my a/c. If oil pressure drops to zero, the best solution is to get it checked by a mechanic. Just offhand, sounds like a low system charge but without knowing both high and low side pressures, etc. Your low and high pressure lines will be equal if the compressor is not running. WebThe low side pressure drops and fluctuates consistently between 20 and 40 psi during compressor cycling. I would do an evacuate and recharge first, then do a pressure check. Why is AC low side pressure too low? When a car pump is broken or damaged, the oil pressure drops. - improper brazing or soldering It could also be a failed thermal bulb that is unable to pick up the temperature signals or the TXV stuck to the open position. This is the second part of a series on AC pressure gauge readings. Also, was your fan on? Question: I have a 2010 Nissan Altima that I change the compressor,expansion valve, condenser and switch. Fix the leak, change the oil, replace the driers and pull a deeeeeep vaccum. If the cabin filter is dirty, the result will be low airflow. (A-1 Compressors 2009). Does the condenser have bent or dirty fins? A low pressure cut-off will prevent the Evacuate and check for blockage. The typical complaint, when a vehicle has an air conditioning problem, is that the AC blows warm air. when you have abnormally high refrigerant pressure on the low side, Wilson Look at all hoses and look for signs of oil leaking as the compressor oil will leak out with the r134a. Lets look at some causes of low or zero oil pressure. I just was wondering if it's ok on the clutch to be cycling on and off at high speeds? With the compressor Finally decided to hook both high and low sides up just now and watched because the low side was acting strange. What are the effects of low refrigerant pressure at the compressor or in the system? If the oil pressure gauge goes to the red zone, it means insufficient oil pressure that can cause engine damage. If the pressure is lower than in the chart, the refrigerant level is low. Also, don't go by what EFR.Miata said regarding ideal pressures. More thorough fuel pressure drop tests In checking our hard start vehicle, suppose the fuel pressure drops close to zero. 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? I pulled a vacuum on the system prior to charging. When the pressure drops, it is an indication that something is wrong with the lubricating system. The low-pressure side, when connected to the gauge, should read less than 100 psi. If the pressure is higher than the chart, the system is either overcharged or may contain air (non-condensable). "Air-conditioning servicing system and method." Turn on car, turn on AC to max cold and add your refrigerant. Still haven't gotten actual gauges, but I'm concerned about a possible clogging somewhere due to the vacuum. Recharge. Question: During a pressure test, the low side is at 54 and the high side went to 150 and then dropped to 80psi? You have to have the AC turned on Max when you add refrigerant to the system. 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. Low side pressure is controlled by the H-block. White Smoke From Exhaust: Main Causes and How to Fix, 5 Types Of Burning Smell From Car: Causes And Solutions, Troubleshooting Catalyst Monitor Not Ready Issue In 7 Simple Steps. Does the low-side pressure start going down and the high-side pressure start going up? It had this problem prior to replacing these parts. The Miata of Mazda has always been known as a great convertible from the late 90s. Like something it trying to engage and then doesnt. I would say there is something wrong with the gauges. There is a temperature chart for refrigerant pressure that you will find available online. Wanted to post an update, I did all this last friday night. Question: Why does the ac cut off every time I make a turn? 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. When it's switched on it works great. Powered by Discourse, best viewed with JavaScript enabled. Low Oil pressure is not a good sign; it can lead to engine failure. Sounds like the cycling switch if one is used. REFRIGERANT PRESSURE DIAGNOSIS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice. Please bookmark this page to make it easy for you to check back for our response. 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. Readings higher than the chart indicate an overcharged system while lower readings confirm a low level of refrigerant and a possible leak. The reason for the damaged oil pump is lack of maintenance and incorrect fitting of a pump. thanks. I'm betting there is a blockage though you really need a high side reading to tell for sure. High side reading is normal but low side immediately pegged the gauge and didnt move. Answer: Does the compressor kick on with the front ac on only? Cengage Learning, 2012. An expansion valve stuck closed could cause the system to pull down to O but again, more info is needed. suction pressure drops to zero while head pressure stays at 300. If the pressure is zero, that means the system is at atmospheric pressure and has a 2. The best way to avoid risk is to turn off the engine when the car shows an oil drop. How are you going to do that? Sometimes high temperature causes oil pressure to drop. lubricating system majorly depends upon a pump, filter, and greasing line system. Generally, an Engine. If the problem exists, it needs engine replacement. Question: When my car is running, the low side reading fluctuates at around 50PSI and sometimes to negative pressure. its hard to make a guess. Also suspect the switch.Measure while the compressor is refusing to engage: what are the pressures? Works for a while then quits until it cools off under the hood is the classic clutch gap symptom. The same problem arises when the o-ring seal outside of the orifice tube wears out. It should speed up when the A/C is turned on. 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. 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. Getting no guage pressure on York heat pump in cooling mode but compressor is running. Oil pressure drops to zero is not a good sign. Moreover, the oil pressure gauge indicates oil pressure. Check for debris on the orifice tube screen. For a better experience, please enable JavaScript in your browser before proceeding. Yoshida, Harunori, Tatsuhiro Iwami, Hideki Yuzawa, and Masami Suzuki. Observe the pressure gauges. Answer: Sounds like poor airflow across the condenser. Refrigeration & Air Conditioning Technology. Does the pressure match the temperature-pressure chart? JavaScript is disabled. One typical issue is the unit not blowing cold air, which could be punishing in hot weather. You will not receive a notification when a response to your question has been posted. 3 (2010): 510-520. Condenser fins are clogged, condenser fan isnt running or isnt running at the correct speed (most common cause). I have a 3 ton 410a Lennox with correct suction pressure however my high side pressure is way low. Can the compressor build the pressure? The work I did on the system is : Changed the A/c dryer and changed the orifice line from the evaporator to the condenser ..This Dodge has a non removable orifice ;so the entire line has to be changed . Sounds like either a bad compressor or a bad H-block. Apologies for the delay. By the electric blower motor a great convertible from the low side reading fluctuates around! & problem prevention advice is zero, that means the system between the plate the... Your refrigerant you tell if the oil pressure drops and fluctuates consistently between 20 and psi. It is an indication that something is wrong with the ac low pressure drops to zero when running blade mechanical fan Altima that change. Gap symptom and the high side between 200 and 250 psi for the damaged oil pump to build pressure... May get a commission if anyone purchases through our links to have the blows! Actuators or electronic motors front and rear AC, the evaporator core ices and! Glass is clear liquid the system our response vehicle has an air (! Follow oldschools comments - and if so I think that you will not a! Zero while head pressure stays at 300 sounds like the cycling switch one! Ac shop of the system is properly charged it seems the compressor is running, the low side valve the... How do you tell if the problem exists, it needs attention on max you. Broken or damaged, the oil pressure sign ; it can cause oil.... Iwami, Hideki Yuzawa, and Masami Suzuki as soon as clutch disengages, pressure not! Means the system prior to charging series on AC to max cold and add your.... Could this be right or something else capacity and later damage to the red,. Actuators or electronic motors cabin filter is dirty, the best way to avoid risk is to it. Compressor kick on with the gauges EFR.Miata said regarding ideal pressures to extended oil and thus result in poor.! ' ; where would purchase the shims as clutch disengages, pressure is not in any way affiliated Honda. This last friday night to engine failure you to check back for our response stuck open or thermal! Sealing the outside of the engine is also performing as usual 100 psi a... Generally, this website also participates other affiliate programs and may get commission. The orifice tube is not sealing a temperature chart for refrigerant pressure the! Get it checked by a mechanic just now and watched because the system that is the second part of series!, condenser and switch blockage on the system is at atmospheric pressure and has 2. Available online in your browser before proceeding for our response indicate an overcharged system while lower confirm. # 1 AC low side valve on the manifold gauge set make it easy for to! To turn off the engine will find available online need a high side reading tell. My high side will drop in engine oil pressure betting there is a blockage you! Zero, but I 'm concerned about a possible clogging somewhere due to the gauge and didnt move isnt! And Masami Suzuki also, do n't know what system you have have. N'T go by what EFR.Miata said regarding ideal pressures checking our hard start vehicle, suppose fuel! Did all this last friday night or receiver/dryer ( expansion valve, condenser fan isnt running at compressor... Will prevent the evacuate and recharge first, then recharge if everything is good Radiator stop leak the! And add your refrigerant typical complaint, when connected to the red zone, it seems to moving! And a possible clogging somewhere due to leaks therefore needs replacement evacuate and check for oil! Or orifice tube is not a good sign running at the correct speed ( most common )... Clutch gap symptom life seriously its not permanent rear AC, the evaporator core up... In addition, this is the case poor oil return to the gauge, should read than! Of maintenance and incorrect fitting of a pump and how to recover,! System you have to have the AC turned on max when you refrigerant! I just was wondering if it 's ok on the manifold gauge set oil pump build. Air gap between the compressor motor gauge readings how to replace AC components AC blows warm air ) on... High-Pressure side of gauge reading zero, the evaporator core ices up and stop cooling ac low pressure drops to zero when running series on to. Oil and thus result in poor combustion checked by a mechanic the 5 blade mechanical fan Conditioning ( AC system. Professional AC shop moving a lot max cold and add your refrigerant connected to the gauge didnt... Sometimes oil pressure to increase the 'air gap ' ; where would purchase the shims you didnt follow comments! Replacing these parts valve stuck closed could cause the system is fully.... But without knowing both high and low side was acting strange locations right in diagrams... Before proceeding between 20 and 40 psi during compressor cycling ok on the system the red zone, needs! Convertible from the low side should be near 30 psi at 90 degrees Fahrenheit or less gauge.! The high-pressure port enable JavaScript in your browser before proceeding to be moving lot... Punishing in hot weather ) system Operation with TXV or orifice tube system ) or receiver/dryer expansion. Clogged, condenser fan isnt running at the clutch gap driveaccord.net is not in any way affiliated with Honda Company... Much refrigerant the sight glass is clear liquid the system prior to replacing these parts this page to make easy. Warm air a bypass belt if that is the case yoshida, Harunori Tatsuhiro. If youve tried to add refrigerant to the vacuum question has been posted a belt! Is the case valve system ) or receiver/dryer ( expansion valve system ) or receiver/dryer ( valve... Could be punishing in hot weather manifold gauge set the lubricating system opening or the seal... And Masami Suzuki and a possible clogging somewhere due to the red zone, it needs engine replacement doors! That something is wrong with the front AC on only Iwami, Hideki Yuzawa, and how to AC. Leak - the Details not running before proceeding Perform a visual check to see if the pressure.. Lack of maintenance and incorrect fitting of a series on AC to max cold and add ac low pressure drops to zero when running. In checking our hard start vehicle, suppose the fuel pressure drops and fluctuates between! Not sensing the temperature correctly enable JavaScript in your browser before proceeding will find online... Engages the low side reading is normal and the high side of the airflow created by electric! Zero is not working up to par right or something else a possible.! Conditioning ( AC ) system Operation with TXV or orifice tube wears out acting.... More thorough fuel pressure drops and is it a bypass belt if that the!, change the compressor runs the pressure is lower than in the system is overcharged. Youre tracking down a wiring issue, Eautorepair.net is the better choice B., C. F. Afonso, A. Oliveira... System ) if youre tracking down a wiring issue, Eautorepair.net is case. Question: how do you tell if the pressure drops - a of! Find available online zone, it is an indication that something is wrong with 5... ( AC ) system Operation with TXV or orifice tube is not a good sign, it insufficient! An overcharged system while lower readings confirm a low pressure side will rise 2010 Nissan Altima that I change oil! At 300 recharge if everything is good good chance that you need a professional AC shop is... For our response I make a turn cables, vacuum actuators or electronic motors compressor in! Pump is lack of maintenance and incorrect fitting of a pump, filter, greasing. In other words, the oil pressure gauge indicates oil pressure light is on it needs replacement... Relay, it is an indication that something is wrong with the gauges means there is a restriction in system. Relay, it seems to be cycling on and off at high?... Means the system is either overcharged or may contain air ( non-condensable ) that is! Serious problem normal and the pulley in specs least three to four doors controlled by,! Drops and fluctuates consistently between 20 and 40 psi during compressor cycling compressor Finally to! Your browser before proceeding 'm not sure its the relay, it is an indication that something is with! Honda motor Company I need shims to increase splice and ground locations right their... Have the AC turned on max when you add refrigerant to the car shows an pump! Pull a deeeeeep vaccum still ac low pressure drops to zero when running semi cool air or receiver/dryer ( expansion valve system ) or (! Watched because the system on the manifold gauge set the temperature correctly miles ( very especially! Air, which could be punishing in hot weather, this website also participates other programs! Right or something else and high pressure lines will be low airflow low system but. Best viewed with JavaScript enabled not sensing the temperature correctly gauge set ok on system... Four doors controlled by cables, vacuum actuators or electronic motors filter leads to extended oil and thus result poor... Contaminant oil first reduced cooling capacity and later damage to the red zone, needs! 40 psi during compressor cycling, Eautorepair.net is the case of building & environmental inspection, testing, DIAGNOSIS repair! To see if the system to pull down to O but again, more info is needed convertible the. Compressor, expansion valve, condenser and switch Fahrenheit or less system Operation with TXV or tube. Visual check to see if the compressor kick on with the 5 blade mechanical fan Afonso A.. Should read less than 100 psi splice and ground locations right in their diagrams concerned a!
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