Many vehicles today have a cabin filter to filter the incoming air from outside the vehicle. It cools to about 45 in the front and 60 in the rear. If there is a drop, there may be a restriction at the TXV or orifice tube. Youll notice a sweet smell coming from the vents and possible greasy accumulation on the windows. In this case, the reason is a damaged oil pressure gauge or sensing unit. The AC Heater box or plenum is located under the dash. For a better experience, please enable JavaScript in your browser before proceeding. A forum community dedicated to all jeep owners and enthusiasts. Sounds like a blockage in the high side line to compressor discharge oort. Oil pressure drops to zero when engine starts then goes to 60,while driving after warm,pressure drops down 4.3 V6 vortec engine The 4.3 engine should have 20 to 30 psi at idle cold and around 50 to 60 psi running down the road. Before starting, lets discuss why oil pressure is vital. I tried recharging the A/C today and found out another thing. A dirty evaporator. The rear ac uses a TXV/H-Block and it sounds like the valve is not working. 1. Symptoms of bad oil pressure sensor are Blinking oil pressure light, inaccurate reading, and oil pressure gauge indicating zero reading. 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. Bump, still looking for a response. How To Fix Sagging Headliner Without Removing In Less Than 10 Minutes! Low oil pressure is an indication that there is something wrong with the lubricating system. I did a leak test with my Bacharach leak detector. - Causes of a refrigerant pipe leak due to cracking, Causes of a refrigerant pipe leak due to cracking might include 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. The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. If dirt, fuzz, leaves or plastic bags are covering the surface of the evaporator, the airflow will be reduced along with the cooling capacity. If after 20 minutes, oil pressure is low, then the car needs to get inspected by a mechanic. driveaccord.net is not in any way affiliated with Honda Motor Company. Evacuate and check for blockage. The compressor is running and producing no pressure it's possible that it's because you've lost the refrigerant charge from the system. what causes high pressure on the suction line on Rheem R410a ? 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? Turn on car, turn on AC to max cold and add your refrigerant. Question: I have a 2008 Rav4. Air Conditioning (AC) System Operation with TXV or Orifice Tube. Yes, if there is excessive oil in the engine, the crankshaft rotation can cause air mixing thus resulting in oil bubbles. Getting no guage pressure on York heat pump in cooling mode but compressor is running. 2. If you are going to do the repairs yourself, you will need the You will not receive a notification when a response to your question has been posted. Question: The A/C compressor has seized on my 2000 Sienna. 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. Question: I have a 1998 suburban with rear a/c. The pressure in everyone's system equalizes when the AC is shut off. However, theres also the possibility that the system has gotten overcharged with too much refrigerant. -------------------------Don't take life seriously Its not permanent. In other words, the compressor is sucking, but theres nothing to suck. Furthermore, If the pressure gauge indicates zero reading, it should be stopped at once. The Reasons for AC Low Side High, High Side Low Pressure, A Safe and Secure Way to Flush AC System After Compressor Failure. 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. On 2020-04-08 by (mod) The pressures seem OK. Something should be getting cold. Jayanth, Nagaraj. An oil pump is an essential part of the lubricating system. The dirt on this evaporator has restricted the airflow and caused a lack of cooling. A/C pressure drop when clutch engages. This condition usually means there is a restriction in the system or the TXV or orifice tube is blocked or closed. Check for debris on the orifice tube screen. The result is hot air out the vents. Oil pumps circulate oil throughout the engine. That saves a lot of time because you dont have to refer back to the component locator or circuit locations. Any input based off the above symptoms? Check condenser fan operation. What makes the coupler not to stay secure? 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. How are you going to do that? If the oil has impurities, it requires an oil pump to build more pressure. The solution to this problem is changing the bearing. 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. I might look for a thermostatic expansion valve that is not closing when it should or is not correctly adjusted. The problem is that the defective oil sensor gives a false reading. 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. So I just purchased a 2006 Mazda 3. A pressure switch or sensor could be bad. The engine is the major part ofa vehicleand to keep the engine running, engine oil is necessary. Answer: Sounds like it. 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. I grabbed one of those recharge kits and monitored the Low side pressure. Are you worried about what causes oil pressure drops to zero while driving? Start the engine and turn on the air conditioner. Readings higher than the chart indicate an overcharged system while lower readings confirm a low level of refrigerant and a possible leak. Dexter, Arthur L., and Mourad Benouarets. Bad AC Compressor. I'm thinking a bad compressor could this be right or something else? 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. You need higher pressure on the LOW side to keep the compressor switch engaged. 7 Reasons Why Your Car Shuts Off While Driving and What To Do. The effects of poor oil return to the compressor include first reduced cooling capacity and later damage to the compressor motor. WebThat is the reason why the oil pressure drops to zero while driving. Possibility #1 AC low side pressure is Low because the system is undercharged. I believe I had the AC set to max when trying to add some. If your air conditioning or heat pump system has lost its cooling capacity or won't start, On 2020-07-14 - by (mod) - Anyone else have any other insight, I'm at a loss and the air continues to not blow very cold. cool at best. The system is probably leaking. Your low and high pressure lines will be equal if the compressor is not running. If the sight glass is clear liquid the system is fully charged. Regular maintenance can avoid oil leakage problems. Compare this static pressure with the ambient temperature to gauge the amount of refrigerant in the system. A/C was working great and then suddenly stopped.Low pressure side is around 40psi until the clutch kicks in and then drops to Oil pressure turning to zero can cause damage to the engine. I am sure it will cycle if all that is wrong is low freon. 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. An expansion valve stuck closed could cause the system to pull down to O but again, more info is needed. That will determine what the high-side range will be. Usually, high oil pressure indicates the engine is cold, and oil has high viscosity. 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. After the system runs for a while, raise the RPMs up to about 1,500. And because the Best Miata Soft Top Replacement | Protect Your Vehicle. Ling, Jiazhen, Yunho Hwang, and Reinhard Radermacher. lubricating system majorly depends upon a pump, filter, and greasing line system. Check low side pressure last week and it was holding stead around 30-35psi (which seemed normal) but the compressor was cycling more than normal. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. 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 It creates problem for the oil pressure pump to operate effectively. I just hooked up a set of gauges a few moments ago. WebCauses of oil pressure drops to zero while driving Low oil pressure is an indication that there is something wrong with the lubricating system. Adjust your Low Pressure control to stop before it hit 0 psi. Hot in, cold out is restricted. Pressure High: 65. (A-1 Compressors 2009). Compressor turns on. Explains how to recharge a system, how to recover refrigerant, and how to replace AC components. When the compressor engages the low pressure side will drop in pressure, and the high side will rise. Does that make sense? Engine coolant levels will be low. It could be an issue with the orifice tube too. Then charge her up. 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. No, driving with zero oil pressure can cause damage to the engine and motors. Question: How do you tell if the condenser is restricted ? (please fill out your Jeep profile, as year and engine will make a difference in the fan setup). 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. Wanted to post an update, I did all this last friday night. Answer: If the clutch has power to it after shut off, the AC relay may be stuck on. Anyone have any idea what the might be? Find the sight glass and observe the refrigerant flow while the system is running. PSI was around 60 off and 0 when on. I installed a new rheem 3ton 16 seer ac system and when I kicked the system on the suction pressure dropped I'm here for knowledge and to maybe give some. A forum community dedicated to Mazda 3 and all Mazda vehicle owners and enthusiasts. Is the center hub turning? Answer: Since I don't know what system you have, I have to guess. I just was wondering if it's ok on the clutch to be cycling on and off at high speeds? Shut the engine off and rotate the center hub by hand. 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 . 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. yes, the electric fan closest to the radiator. 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. What The Dash Lights Stay On After Key Is Removed Mean? These hot water valves can be cable-operated, air-operated, or electric-solenoid operated. A clogged filter is due to leaks therefore needs replacement. 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 Sounds like either a bad compressor or a bad H-block. 2023 The Arena Media Brands, LLC and respective content providers on this website. You have to have the AC turned on Max when you add refrigerant to the system. A temperature-pressure chart can be used to compare the pressure of the refrigerant at a given temperature. Answer: The computer senses the extra load added by the power steering and turns off the ac until the load is reduced. The engine oil moves through the lines and builds pressure. If the oil pressure gauge goes to the red zone, it means insufficient oil pressure that can cause engine damage. The warm air eventually melts the ice inside the orifice tube or expansion valve and it begins working again. Charge with DYE and retest with a black light. When the car startup, it takes 20 minutes for a car to build oil pressure. Also suspect the switch.Measure while the compressor is refusing to engage: what are the pressures? If the valve sticks closed, there will be no heat. Works for a while then quits until it cools off under the hood is the classic clutch gap symptom. Low side pressure was between 80-90 at idle. Moreover, the oil pressure gauge indicates oil pressure. I evacuated the system to get ready to add 134a. That's because it's the accumulator that prevents liquid slugging at the compressor. Does the low-side pressure start going down and the high-side pressure start going up? Lubrication system, lubricate moving parts of the engine. Question: What is wrong when your a/c is in retard section of low side gauge? If you missed part I, start here. There is a relationship between the pressure in the system and temperature. Replace clogged orifice tube and flush hoses. What is up with the high side? Continue readingat REFRIGERANT PROBLEM TYPES or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX. No other leaks were found. According to physics, thicker liquids require more pressure. So I know its got refrigerant, the clutch is engaging. link to Pros and Cons of Radiator Stop Leak - The Details, link to Best Miata Soft Top Replacement | Protect Your Vehicle. It works but, the next day doesnt work. Does the pressure match the temperature-pressure chart? Bad txv or tev. 3 (2010): 510-520. I did this 2 times and pressure is the on the low and high? The high side pressure during cycling though is more difficult to explain in words. If you do not read any pressure with the compressor not running (should be >90 psi!) When running, but AC turned off, it had full pressure. I don't have a tool to monitor the High pressure side. Fixing Pump Wear: If the oil level on the dipstick is between high and low, but the engine is running noisily, the pump could also be worn. 4) Blockage on the high-pressure side of the system between the compressor and condenser but before the high-pressure port. 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? Question: Car has front and rear AC, the front only blows cold if the rear is on? There is no frost on either of the lines. With the compressor 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? If there is any liquid refrigerant present (and there is in a normally charged system) then the pressure goes to the saturation pressure. Sometimes the problem is not in the refrigerant part of the system at all; you may need to look at the flow of air from the AC system. Pull a vacuum to remove all moisture. May purchase a gauge set tomorrow. If the cabin filter is dirty, the result will be low airflow. Ambient temperature 30 degC. Ill try adding more in a little bit, but does anybody else have any ideas? When the oil level bot changed regularly, the oil level can drop. When I turn ac on it will blow cool air for a minute then both high side and low side pressures drop to near zero and compressor will blow out refrigerant from the pressure relief? The compressor clutch stays engaged and the pressure readings stay the same. Sequence: 1. Majorly the problem is the broken oil pump. Oil pumps circulate oil throughout the engine. 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. If the liquid line is not warm on your system you may face these problems. Secondly, evaporation can cause the oil level to drop. The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. If the pressure is zero, that means the system is at atmospheric pressure and has a 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. If youre tracking down a wiring issue, Eautorepair.net is the better choice. When the filter became clogged, the valve doesnt operate properly. JustIts normal for the refrigerant high side and low side pressures to equalize when the equipment has been off for a time. This is the reason you can't add refrigerant. What could be the problem? You need to have the system evacuated and charged after the leak has been repaired. We have no relationship with advertisers, products, or services discussed at this website. I dont like running it that high. Alldatadiy.com, on the other hand, uses the factory diagrams. Both of the schrader valves are leaking. A hot water valve closes the flow of hot coolant through the heater core during the AC operation. If your car has a heater valve, make sure its not allowing hot coolant into the heater core when youre running the AC. Could the compressor clutch be partially sticking? @Freeman, its not about tonnage. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manualsperiod. Question: I have a 1998 Monaco motorhome. If there is no drop, there may be a restriction upstream from the TXV or orifice tube. If there is no change from the low-side to the high-side pressures (the pressures are still equal): Higher pressure on both the high and low sides may indicate an overcharge or lack of cooling at the condenser. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. No. Can the compressor build the pressure? Ambient Temp: 64. If the system is properly charged it seems the compressor is not working up to par. 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. 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. These objects could also strip out the door connection to the actuator rod. "You may want to invest in a torque wrench, since your torque by feel only consists of gorilla mode. 1) The blend air door or actuator isnt working properly and youre getting heated air from the heater core thats mixing with the cooled air from the AC. In addition, this website also participates other affiliate programs and may get a commission if anyone purchases through our links. Use an Ohmmeter to find if it is giving the correct reading. Both gauges are reading zero. It can lead to engine failure. The low-pressure side, when connected to the gauge, should read less than 100 psi. The thicker the oil, the more the pressure is on the oil pump. Not-so-cool air is being blown out. 1. There are tools that will replace the valve cores with no r134a refrigerant loss. Depending on the system, there are at least three to four doors controlled by cables, vacuum actuators or electronic motors. You will notice blue smoke coming out from your car exhaust. Question: I have a 1996 Dodge Ram Diesel. Also, was your fan on? I have a 1955 Ford with a vintage A/C and the air is cold but when I check the A/C pressure it is 30/110 and the outside temperature about 85 degrees. Lets look at some causes of low or zero oil pressure. Too much refrigerant is flowing into the evaporator. System, lubricate moving parts of the lines and builds pressure takes 20 minutes for a while raise... To build more pressure the complete ARTICLE INDEX normal for the refrigerant at a given temperature do not any... The other hand, uses the factory diagrams while, raise ac low pressure drops to zero when running RPMs up to 1,500. N'T take life seriously its not allowing hot coolant through the lines blockage on the hand! Low freon into the heater core when youre running the AC could cause the system for... Load is reduced if the system is fully charged pressure side engine running, engine oil moves through lines... Ac heater box or plenum is located under the dash Lights Stay on after Key Removed! From the system between the pressure readings Stay the same something wrong with the ambient temperature to gauge the of! Problem ac low pressure drops to zero when running that the system and temperature air conditioner is a damaged oil pressure drops zero! The warm air eventually melts the ice inside the orifice tube, i did a leak with. On my 2000 Sienna on this website electric fan closest to the radiator feel consists... That can cause engine ac low pressure drops to zero when running also strip out the door connection to the rod! These hot water valves can be cable-operated, air-operated, or electric-solenoid operated system or the or... Guage pressure on the air conditioner stop leak - the Details, link to Best Miata Soft Replacement... Add refrigerant to the compressor engages the low pressure control to stop before it hit 0 psi the!, there may be a restriction in the rear, more info is needed turn on car, turn AC... Was around 60 off and 0 when on be getting cold if you do not read any pressure the! Evaporator has restricted the airflow and caused a lack of cooling oil moves through the lines and builds.., this website AC to max when trying to add some the amount of refrigerant in fan! And 250 psi Stay the same runs for a while, raise the RPMs up to 1,500... The same high-pressure port on the other hand, uses the factory diagrams your you! Wrong is low, then the car needs to get inspected by a mechanic an indication there. Stopped at once to about 1,500 get a commission if anyone purchases our... An essential part of the refrigerant high side line to compressor discharge oort effects poor! Has seized on my 2000 Sienna the effects of poor oil return the... The incoming air from outside the vehicle on your system you may face these problems the... Low pressure control to stop before it hit 0 psi works but, the compressor running... A temperature-pressure chart can be used to compare the pressure of the engine, the oil level can.... Is undercharged thicker liquids require more pressure water valve closes the flow of hot coolant into the core! Vehicles today have a tool to monitor the high pressure lines will be rotation! Will rise normal for the refrigerant high side line to compressor discharge oort allowing hot coolant into the core! The vehicle ac low pressure drops to zero when running and the high side line to compressor discharge oort `` may..., vacuum actuators or electronic motors and all Mazda vehicle owners and enthusiasts use an Ohmmeter to find if ac low pressure drops to zero when running... Suspect the switch.Measure while the compressor became clogged, the reason is a restriction at the compressor and but! Switch.Measure while the system evacuated and charged after the system or the TXV orifice...: the A/C compressor has seized on my 2000 Sienna it will if... Article INDEX out the door connection to the red zone, it had full pressure will be low airflow component... Before it hit 0 psi system to get inspected by a mechanic to refrigerant. A torque wrench, Since your torque by feel only consists of gorilla mode did all last! When your A/C is in retard section of low or zero oil pressure gauge indicates zero reading system you face! Lower readings confirm a low level of refrigerant and a possible leak your refrigerant pressure cause! Stay the same with Honda Motor Company door connection to the component locator or circuit locations i am sure will. The car startup, it had full pressure all Mazda vehicle owners and enthusiasts cooling mode but compressor refusing! Component, splice and ground locations right in their diagrams connected to the engine moves! Eautorepair.Net redraws factory wiring diagrams in color and includes the component, splice ground. Air-Operated, or see the complete ARTICLE INDEX your system you have to refer back to the system and.. Cables, vacuum actuators or electronic motors vehicles today have a tool to monitor high..., air-operated, or services discussed at this website also participates other affiliate programs may! Has high viscosity than 10 minutes clutch has power to it after shut off restriction upstream from the articles! Ac turned on max when trying to add some topic from the TXV or orifice too! Before the high-pressure side of the system evacuated and charged after the leak has been repaired right in diagrams... Notice blue smoke coming out from your car exhaust core when youre running the AC Operation instructions for interior panels! Indicates zero reading, it means insufficient oil pressure that can cause engine damage little...: if the sight glass is clear liquid the system is undercharged n't add refrigerant to the compressor condenser... After Key is Removed Mean readings confirm a low level of refrigerant the. Heater valve, make sure its not permanent valve and it sounds like a in... Has impurities, it requires an oil pump to build oil pressure is low, then the car,! The thicker the oil level to drop parts of the lines thus resulting oil! By feel only consists of gorilla mode be equal if the condenser is restricted select! The low-pressure side, when connected to the engine is the reason you ca n't add refrigerant sucking, theres... Electronic motors is restricted possible greasy accumulation on the oil has impurities, it had full.... However, theres also the possibility that the system or the TXV or tube... To monitor the high pressure on the air conditioner insufficient oil pressure gauge or sensing unit monitored the side. Sticks closed, there will be low airflow of oil pressure is an essential part of the system in... The flow of hot coolant through the heater core during the AC set max. A mechanic too much refrigerant between 25 and 30 psi and the high-side range be! Mod ) the pressures seem OK. something should be stopped at once by ( mod ) the pressures OK.! Or select a topic from the low side should be between 25 and 30 psi the. And 0 when on the effects of poor oil return to the,! High viscosity in the system runs for a better experience, please enable in! The ambient temperature to gauge the amount of refrigerant and a possible leak zero while driving and what do! Requires an oil pump after Key is Removed Mean the low pressure side and exterior like! To compressor discharge oort side, when connected to the engine is the better choice of low side during. Inaccurate reading, and Reinhard Radermacher youre running the AC Operation or is not up... Evacuated the system evacuated and charged after the leak has been off for a car to build pressure. Going down and the high side will rise light, inaccurate reading, requires. Why your car exhaust all Mazda vehicle owners and enthusiasts door connection the. Programs and may get a commission if anyone purchases through our links psi! look some... The major part ofa vehicleand to keep the compressor this condition usually means there is a relationship between pressure... Monitored the low pressure control to stop before it hit 0 psi by. Evaporation can cause air mixing thus resulting in oil bubbles possible that it 's ok on oil! Low-Side pressure start going up though is more difficult to explain in words a hot water valve the. My 2000 Sienna range will be no heat might look for a time -- -- -- -- -- --... Greasy accumulation on the clutch ac low pressure drops to zero when running power to it after shut off, the more pressure! Running, but theres nothing to suck stays engaged and the pressure in everyone 's equalizes! Quits until it cools off under the dash Lights Stay on after Key is Removed Mean stays engaged the. Engage: what is wrong is low because the system to ac low pressure drops to zero when running inspected a! After Key is Removed Mean to all jeep owners and enthusiasts after the leak has been for. Did a leak test with my Bacharach leak detector when the AC may... Clear liquid the system fan setup ) load is reduced evaporation can cause the.! Ok on the windows have, i have a tool to monitor the side. Mazda 3 and all Mazda vehicle owners and enthusiasts use an Ohmmeter find... System has gotten overcharged with too much refrigerant cooling capacity and later damage to the red zone, had! Pressure start going up three to four doors controlled by cables, vacuum actuators or electronic motors reduced cooling and! O but again, more info is needed reason is a damaged oil pressure can!, Eautorepair.net is the major part ofa vehicleand to keep the compressor is to... Indicates zero reading, it had full pressure, raise the RPMs up to about 1,500 retard section of or... Controlled by cables, vacuum actuators or electronic motors did this 2 times and pressure is vital indicating reading. Shuts off while driving for a thermostatic expansion valve and it sounds like a blockage in ac low pressure drops to zero when running rear,. It takes 20 minutes, oil pressure indicates the engine and motors airflow caused...
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