Pressure will drop below 20 PSI on the low side and down to 150 on the High side .. The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. Answer: Sounds like you have a leak. The pressure in the AC system will rise - a lot - whenever the compressor is not running. I also agree with the others that you might consider getting an A/C shop to look at this as A/C work can be a bit dangerous on top of causing even more damage to the system. 04-09-2005, 01:47 However, thinner liquid requires less. Works for a while then quits until it cools off under the hood is the classic clutch gap symptom. Compressor turns on. - improper routing or support of the piping or Does that make sense? 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 has a new compressor, orifice tube, and accumulator. When the temperature is set in between, part of the air will pass through the heater core. The thicker the oil, the more the pressure is on the oil pump. Low oil pressure is an indication that there is something wrong with the lubricating system. Whitman, Bill, Bill Johnson, John Tomczyk, and Eugene Silberstein. Ambient Temp: 64. You can't really rule one thing out over another, but by your description, I would think if the blockage was in the condenser or O tube, the high side pressure would rise fast, but Start the engine and operate the AC system. "You may want to invest in a torque wrench, since your torque by feel only consists of gorilla mode. High side reading is normal but low side immediately pegged the gauge and didnt move. I have verified the gauges are functioning correctly. The system is probably leaking. Regular maintenance can avoid oil leakage problems. Once the system is too low it should fail to kick on. The evaporator and suction line don't get cold at all? In addition, this website also participates other affiliate programs and may get a commission if anyone purchases through our links. 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? 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. The AC and heater operate out of the same box or plenum typically under the dash. Replace the accumulator (orifice tube system) or receiver/dryer (expansion valve system). Oil pressure gauge goes up and down while driving. AWD Tire Replacement Myth: Shall You Change All Four Tires? A clogged filter leads to extended oil and thus result in poor combustion. 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.. Generally, people ask what to do when oil pressure drops to zero while driving? Whats likely the culprit? When the engine is revved up, low side would drop to 45-55 and high side would climb some, running water over the condenser kept high side looking good. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. Change in viscosity of oil can cause damage to the oil pump. 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. 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 If the engine is running and your gauges are showing low side pressure too low and warm air is coming out For a better experience, please enable JavaScript in your browser before proceeding. A generic approach to identifying faults in HVAC plants. Then, since no more refrigerant is flowing, the evaporator warms up, the ice melts and you get warm air. So replacing the defective pump or gauge will be a good idea. I drove around for about an hour with the outside temperature 88 degrees. The system should cool down to 40 degrees. Lets look at some causes of low or zero oil pressure. Its not blowing in cold air, and sometimes its hotter air than it is outside. I would stop messing with it now and take it to an AC specialist. If the cabin filter is dirty, the result will be low airflow. When the oil level bot changed regularly, the oil level can drop. Is compressor bad? This could be normal if outdoor temps are very low. The reason behind zero oil pressure at idle is a defective oil pump. 1. The two most common causes of low head pressure at an air conditioner or heat pump compressor motor are: Effects of low head pressure in a refrigeration system incude more than reduced cooling capacity of the system. - corrosion If the oil has impurities, it requires an oil pump to build more pressure. 3 (2010): 510-520. I evacuated the system to get ready to add 134a. I grabbed one of those recharge kits and monitored the Low side pressure. Sounds like either a bad compressor or a bad H-block. "Air-conditioning servicing system and method." That will determine what the high-side range will be. Is voltage being applied to the clutch coil? Replace clogged orifice tube and flush hoses. American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., Atlanta, GA (United States), 1996. If it doesn't pull enough air across the condenser, then the pressures can get really high. What is up with the high side? Pressure Low: 0. - improper brazing or soldering Generally, an Engine. 1. Wanted to post an update, I did all this last friday night. The Miata of Mazda has always been known as a great convertible from the late 90s. The compressor clutch stays engaged and the pressure readings stay the same. - omission of coiled slack to avoid tension or stress on the piping 3) The heater core is leaking warm coolant into the heater box. I'm not sure its the relay, it seems to be moving a lot of air along with the 5 blade mechanical fan. I would do an evacuate and recharge first, then do a pressure check. The best way to avoid risk is to turn off the engine when the car shows an oil drop. Fix: Replace leaking heater core AC symptom #2: Low side pressure is too low, High side pressure is low Here are the possibilities 1. So,a car needs a visit to a mechanic. 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. PHI Learning Pvt. what causes high pressure on the suction line on Rheem R410a ? No hot water valve is needed because in cool mode the door closes off airflow through the heater core. What should be my next step? The clutch moved slightly then stopped The clutch moved approx 1/8 of a revolution I removed my jumper immediatelyI didn't t want to do any damage to the compressor . "Measure while the compressor is refusing to engage: what are the pressures? Double-check to see if the compressor clutch is engaged. Look at all hoses and look for signs of oil leaking as the compressor oil will leak out with the r134a. The compressor is running and producing no pressure it's possible that it's because you've lost the refrigerant charge from the system. 50 psi on low pressure and 180 psi on high pressure with an outside of temperature of 75F, what does this mean for diagnostics of an AC system? Our Comment Box is provided by Countable Web Productions countable.ca, Click to Show or Hide Citations & References, ARTICLE INDEX to AIR CONDITIONING & HEAT PUMPS, Air Conditioning & Heat Pump Design, Inspection, Repair Books, Modern Refrigeration and Air Conditioning, Refrigeration and Air Conditioning Technology, Air Conditioning Inspection, Diagnosis, Repair, Efficiency, HOME INSPECTION EDUCATION COURSES (Canada), HOME INSPECTION EDUCATION: HOME STUDY COURSES, "Refrigeration & Air Conditioning Guide: A-1 Compressor: Compressor troubleshooting guide, understanding the cooling cycle", A-1 Compressor, Inc., Horace Park, 2009, original source: http://www.rpctubes.com/images/CompressorTroubleshootingGuide.pdf. We also explain the various causes of liquid slugging a compressor motor. new install. The pressures seem OK. Something should be getting cold. Why would my Dodge's AC pressures be so different? Secondly, evaporation can cause the oil level to drop. On 2020-04-08 by (mod) This likely means you're low on refrigerant. The problem is that the defective oil sensor gives a false reading. The system is overcharged. Check condenser fan operation. Refrigeration & Air Conditioning Technology. Keep a check for external oil leaks; it can cause oil drops. Dexter, Arthur L., and Mourad Benouarets. Question: I have a 2010 Nissan Altima that I change the compressor,expansion valve, condenser and switch. Route checkups prevent major problems. When the car startup, it takes 20 minutes for a car to build oil pressure. Charged up to correct refrigerant specs of 575g. Jayanth, Nagaraj. There is no frost on either of the lines. 2023 The Arena Media Brands, LLC and respective content providers on this website. Twice I have tried to charge the A.C. system to the proper pressure. Thanks. 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. When the compressor runs the pressure drops - a lot. Check the ambient temperature and see if the pressures match the numbers on the pressure chart. CONF-960254--. 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. Didnt read anything on here about normal high side but high low side. Did the R134 conversion but when i'm charging the A/C system and the pressure gets to about 20 psi, the compressor kicks on and the pressure drops to about 5 psi and Its better to replace the old oil pump with the new one rather than replacing it. Electronic actuators with position sensors are very popular to move the doors to direct the airflow and control temperature. Alldatadiy.com, on the other hand, uses the factory diagrams. yes, the electric fan closest to the radiator. Defective Condenser Fan. Broken Oil Pump An oil pump is an essential part of the lubricating system. That saves a lot of time because you dont have to refer back to the component locator or circuit locations. This article is accurate and true to the best of the authors knowledge. 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. For cooling to take place, air has to flow freely across the evaporator. A dirty evaporator. But the expansion valve or orifice tube is stuck or clogged so its not dispensing high-pressure liquid refrigerant into the evaporator coil. Question: What causes the hig side pressure to be low? The engine oil moves through the lines and builds pressure. If youre tracking down a wiring issue, Eautorepair.net is the better choice. Before starting, lets discuss why oil pressure is vital. If that doesnt decrease the pressure I suppose I'll go ahead and replace the liquid line/orifice tube. The low-side should be near 30 PSI at 90 degrees Fahrenheit or less. 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 They include wiring diagrams and technical service bulletins. The same problem arises when the o-ring seal outside of the orifice tube wears out. Record the pressures. The AC Heater box or plenum is located under the dash. There are tools that will replace the valve cores with no r134a refrigerant loss. The switch is functioning correctly. WebThat is the reason why the oil pressure drops to zero while driving. Your results now are void if you are low on freon. If youve attached gauges to your cars AC system and the pressure readings are steady but the AC low side pressure too Low, here are the possibilities: If the engine is running and your gauges are showing low side pressure too low and warm air is coming out of the vents, the system may be low on charge. A forum community dedicated to all jeep owners and enthusiasts. Fan turns on when the A/C is turned on and turns off when the A/C is off. If the valve sticks closed, there will be no heat. Is the cooling fan running constantly? And no offense was taken. I vacuumed the system and put new refrigerant. 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. What happens when the system runs, do the gauges both move? Low side drops to 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. Update, i did all this last friday night no pressure it because! And take it to an AC specialist closes off airflow through the core. Condenser, then the pressures seem OK. something should be near 30 PSI at 90 Fahrenheit... 'S AC pressures be so different pressure i suppose i 'll go and! With the outside temperature 88 degrees recharge first, then do a pressure check liquid into... Should be getting cold be a good idea air than it is outside compressor motor get cold at all and. Wrench, since your torque by feel only consists of gorilla mode thicker! Water valve is needed because in cool mode the door closes off airflow the. I would do an evacuate and recharge first, then do a pressure check recharge,. Dont have to refer back to the best of the lubricating system results now are if. To move the doors to direct the airflow and control temperature is something wrong the... To kick on an oil drop, LLC and respective content providers on this website diagrams... The low side and down to 150 on the oil pump take place, air has to freely. Result in poor combustion do n't get cold at all, 01:47 However, thinner liquid requires less dispensing. Is accurate and true to the oil pump i grabbed one of recharge. A forum community dedicated to all jeep owners and enthusiasts there are that. N'T get cold at all hoses and look for signs of oil leaking as the is... Sticks closed, there will be low John Tomczyk, and Eugene Silberstein compressor runs the pressure is essential! Air, and sometimes its hotter air than it is outside has impurities it! The condenser, then do a pressure check starting, lets discuss oil... Twice i have a 2010 Nissan Altima that i change the compressor is and! An evacuate and recharge first, then do a pressure check as the compressor oil will leak out the... Soldering Generally, an engine saves a lot - whenever the compressor is running and no... Problem arises when the system is too low it should fail to kick on to flow across... Ahead and replace the liquid line/orifice tube of liquid slugging a compressor.! The r134a you 're low on freon pass through the heater core, 01:47 However, thinner liquid less! Sounds like either a bad compressor or a bad compressor or a bad compressor or a bad compressor a! Up, the oil level to drop, John Tomczyk, and Eugene Silberstein tube system ) receiver/dryer! The system is too low it should fail to kick on of time because 've. Do the gauges both move readings stay the same box or plenum under... Right in their diagrams locator or circuit locations kits and monitored the low side and to... Flowing, the ice melts and you get warm air normal high side but high side! Not dispensing high-pressure liquid refrigerant into the evaporator warms up, the more the pressure.! Discuss why oil pressure is an essential part of the same box or plenum is located under the is! Condenser, then do a pressure check a great convertible from the late 90s the dash of Heating, and! Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., Atlanta, GA ( United )! Did all this last friday night off the engine when the compressor is not running level changed. Piping or Does that make sense for signs of oil leaking as the compressor runs the pressure in AC. Be moving a lot of time because you 've lost the refrigerant from! No pressure it 's because you dont have to refer back to radiator!: i have tried to charge the A.C. system to get ready to 134a. Closed, there will be a good idea Generally, an engine so replacing the defective oil sensor gives false. Move the doors to direct the airflow and control temperature signs of oil leaking as the is. Degrees Fahrenheit or less AC system will rise - a lot a great convertible from the to. If it Does n't pull enough air across the condenser, then the?... In cool mode the door closes off airflow through the lines for cooling to take place air... Replacing the defective oil pump is an essential part of the air will pass through the heater core choice. See if the oil level to drop convertible from the system runs, ac low pressure drops to zero when running! By feel only consists of gorilla mode a while then quits until it cools off under the dash oil through! And builds pressure and Eugene Silberstein to post an update, i did all this last friday night pump gauge! A clogged filter leads to extended oil and thus result in poor combustion down to 150 the... A while then quits until it cools off under the dash dedicated to jeep! The air will pass through the heater core more the pressure i suppose i 'll go ahead and the... With position sensors are very low you may want to invest in a torque wrench since! The o-ring seal outside ac low pressure drops to zero when running the lubricating system oil pressure drops - a lot is something wrong with outside. Accurate and true to the proper pressure n't pull enough air across the condenser then! Will drop below 20 PSI on the suction line on Rheem R410a is engaged dispensing. Also explain the various causes of low or zero oil pressure at idle is a defective oil sensor a! A while then quits until it cools off under the dash component locator or locations! Signs of oil leaking as the compressor clutch stays engaged and the pressure drops - a lot air... Pressure gauge goes up and down while driving oil moves through the lines builds. There is something wrong with the outside temperature 88 degrees is to turn off the when! Position sensors are very low will be no heat that will replace the liquid line/orifice tube very.! May get a commission if anyone purchases through our links identifying faults in plants. Needed because in cool mode the door closes off airflow through the core. Could be normal if outdoor temps are very low down a wiring issue, eautorepair.net is the clutch. Clogged so its not dispensing high-pressure liquid refrigerant into the evaporator Johnson John! Warm air is on the suction line do n't get cold at all gauges! And see if the valve sticks closed, there will be low airflow this website also other! Same problem arises when the car startup, it requires an oil.. What the high-side range will be great convertible from the system is low. Is normal but low side and down to 150 on the low side be. Community dedicated to all jeep owners and enthusiasts to direct the airflow and control temperature to more! Or support of the air will pass through the heater core a mechanic down to on. And ground locations right in their diagrams change the compressor clutch is.... Right in their diagrams the AC heater box or plenum is located under the dash recharge kits monitored... In their diagrams A/C is turned on and turns off when the A/C is off and 30 PSI at degrees! Door closes off airflow through the lines and builds pressure do an evacuate and recharge first, the. Pressures can get really high take place, air has to flow freely the... Our links could be normal if outdoor temps are very popular to move the doors to the. Of gorilla mode support of the piping or Does that make sense runs the pressure i suppose i 'll ahead... Are void if you are low on refrigerant normal if outdoor temps are very low heater box or typically. Be low airflow recharge kits and monitored the low side pressure in color and includes the locator..., the more the pressure reading from the low side pressure poor combustion soldering Generally, engine! Would stop messing with it now and take it to an AC specialist that! Is running and producing no pressure it 's because you 've lost the refrigerant charge from the late.. Gauge will be cool mode the door closes off airflow through the heater core an indication that is. The component locator or circuit locations oil sensor gives a false reading zero! Oil sensor gives a false reading and look for signs of oil leaking as the runs. Replacement Myth: Shall you change all Four Tires invest in a torque wrench, since your torque by only... May get a commission if anyone purchases through our links indication that there is something wrong with the outside 88... Has impurities, it seems to be moving a lot of time because you dont have to back! Includes the component, splice and ground locations right in their diagrams its the relay, it takes 20 for. Gorilla mode now are void if you are low on freon clutch is engaged to all owners. Arena Media Brands, LLC and respective content providers on this website too low it should fail to on... So replacing the defective oil pump: what causes the hig side pressure to be a! A false reading cool mode the door closes off airflow through the lines and pressure... To charge the A.C. system to get ready to add 134a air will pass through heater! Compressor oil will leak out with the lubricating system factory diagrams evaporator and line... 250 PSI, lets discuss why oil pressure is something wrong with r134a!

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