Getting no guage pressure on York heat pump in cooling mode but compressor is running. 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. When a car pump is broken or damaged, the oil pressure drops. 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. Any ideas where to go from here? If there is a drop, there may be a restriction at the TXV or orifice tube. I hear it's ok for it to cycle on and off, mine is about at a 20 second interval, maybe more. The filter looks like a small air filter from a car. The orifice tube has too large of an opening or the o-ring sealing the outside of the orifice tube is not sealing. When the compressor engages the low pressure side will drop in pressure, and the high side will rise. So I just purchased a 2006 Mazda 3. Fan turns on when the A/C is turned on and turns off when the A/C is off. Fix: None needed. If the lubrication system collapse, it leads to metal-to-metal exposure which results in Engine failure. Compressor turns on. If LOW side drops, like 0, it turns off Sometimes oil pressure light is on, but the oil level is normal and the engine is also performing as usual. Lets look at some causes of low or zero oil pressure. Webnew install. Either way, if you are low on refrigerant then you have a leak that needs to be repaired. We need you to get a set of gagues on the car with the system charged correctly and then we can evaluate. Fix: Replace a bad blend door actuator or faulty heater control valve or repair a faulty blend door or blend door linkage. Clutch plate air gap between the plate and the pulley in specs. But the high side is extremely low. 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. Why would my Dodge's AC pressures be so different? The system is overcharged. Whitman, Bill, Bill Johnson, John Tomczyk, and Eugene Silberstein. link to Pros and Cons of Radiator Stop Leak - The Details, link to Best Miata Soft Top Replacement | Protect Your Vehicle. Without knowing static pressure this is a guess. Does the pressure go up? If the static pressure is low, a leak is probably present. There are tools that will replace the valve cores with no r134a refrigerant loss. What should be my next step? However, a radiator leak can occur if one of these components goes bad. Oil pressure drops to zero is not a good sign. 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. If not, the compressor may be worn out. Actual readings will vary according to ambient temperature. The rear ac uses a TXV/H-Block and it sounds like the valve is not working. Low side drops to If there is any liquid refrigerant present (and there is in a normally charged system) then the pressure goes to the saturation pressure. Fix: Clean condenser fins and check for dented condenser tubes. 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. Twice I have tried to charge the A.C. system to the proper pressure. Turn on car, turn on AC to max cold and add your refrigerant. @Freeman, its not about tonnage. A forum community dedicated to Mazda 3 and all Mazda vehicle owners and enthusiasts. Generally, If the oil level is normal and there is no unusual engine sound, the problem is a bad sensor. If not front ac control problem. It could be an issue with the orifice tube too. 2. 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. Engine Size: 2.4l. "Theoretical study on separate sensible and latent cooling air-conditioning system." No. Why would they call it a bypass belt if that is the case? Answer: Sounds like the gauges are not connecting. 3) Partial blockage of the orifice tube/expansion valve and the evaporator. Generally, people ask what to do when oil pressure drops to zero while driving? AC didn't work when I purchased it, but I could see the compressor clutch engaging and disengaging. Too much refrigerant is flowing into the evaporator. The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. Answer: The computer senses the extra load added by the power steering and turns off the ac until the load is reduced. Im completely stuck. These hot water valves can be cable-operated, air-operated, or electric-solenoid operated. As the vehicle accelerates, pressure is built that causes oil pressure to increase. I pulled a vacuum on the system prior to charging. Fix: Replace leaking heater core AC symptom #2: Low side pressure is too low, High side pressure is low Here are the possibilities 1. A dirty evaporator. 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? 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 Fix: Remove excess refrigerant or evacuate and recharge with the correct amount. Applied Thermal Engineering 17, no. Pressure High: 65. Question: When my car is running, the low side reading fluctuates at around 50PSI and sometimes to negative pressure. Yoshida, Harunori, Tatsuhiro Iwami, Hideki Yuzawa, and Masami Suzuki. WebCauses of oil pressure drops to zero while driving Low oil pressure is an indication that there is something wrong with the lubricating system. Suppose you notice low oil pressure at idle. Answer: I assume it is an R12 system that has been converted to R134a. The Arena Media Brands, LLC and respective content providers to this website may receive compensation for some links to products and services on this website. If you are going to do the repairs yourself, you will need the If the valve sticks closed, there will be no heat. The reason behind zero oil pressure at idle is a defective oil pump. He has more than 15 years experience on repair and maintenance of different kinds of vehicles. I evacuated the system to get ready to add 134a. driveaccord.net is not in any way affiliated with Honda Motor Company. On a 85 degree day:R22 - 200 roughly R410 - 300 roughly. If the system is properly charged it seems the compressor is not working up to par. When you shut off the AC you hear a hissing noise. Ltd., 2010. Any suggestions? Bad txv or tev. High side reading is normal but low side immediately pegged the gauge and didnt move. After the system runs for a while, raise the RPMs up to about 1,500. I installed a new rheem 3ton 16 seer ac system and when I kicked the system on the suction pressure dropped Normally, if you look at the assembly, pressure gauge is installed after the filter. One symptom indicating a complication in the air conditioning is AC low side high, high side lowpressure. PSI was around 60 off and 0 when on. With the compressor WebThat is the reason why the oil pressure drops to zero while driving. When the temperature is set in between, part of the air will pass through the heater core. It has a new compressor, orifice tube, and accumulator. Answer: 2020 Mustang should be R1234yf refrigerant. 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. 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. Evacuate and check for blockage. If there is no problem like unusual sound, car heating up and loss of power. A low pressure cut-off will prevent the 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 . Drive Accord forum, a community where Honda Accord owners can discuss reviews, service, parts, and share mods. Bad AC Compressor. If the sight glass is clear liquid the system is fully charged. It can lead to engine failure. I'm here for knowledge and to maybe give some. HubPages is a registered trademark of The Arena Platform, Inc. Other product and company names shown may be trademarks of their respective owners. On the other hand, there is possibly a huge leak when the pressure is zero. AC Low Side High, High Side Low: Why Does This Happen? 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 Low head pressure may occur simulataneously with high pressure on the suction side of an air conditioner, heat pump or refrigeration system compressor system. Shut the engine off and rotate the center hub by hand. Thanks. Jayanth, Nagaraj. 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. In most cases, their diagrams are right from the factory manuals. 4) Blockage on the high-pressure side of the system between the compressor and condenser but before the high-pressure port. My mechanic says any bypass belt still will use the pulley or pass through the area of the compressor pulley. Fix: Check for leaks and repair. You will notice blue smoke coming out from your car exhaust. 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. 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. 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. The evaporator and suction line don't get cold at all? Lower pressures may indicate low refrigerant level or a weak compressor. Replace expansion valve, flush and install in-line filter. Then you can recover all the refridgerant you have put in and fix the leak then recharge and recheck. If the system is continuing to cool it may be doing so at reduced capacity, observed as a loss of up to ten degrees of temperature drop across the coil. If the problem exists, it needs engine replacement. Question: I have a 1998 Monaco motorhome. Use an Ohmmeter to find if it is giving the correct reading. They include wiring diagrams and technical service bulletins. If the system is continuing However, thinner liquid requires less. The system must be evacuated before charging. CONF-960254--. Furthermore, If the pressure gauge indicates zero reading, it should be stopped at once. lubricating system majorly depends upon a pump, filter, and greasing line system. You might be sitting at the borderline. The Miata of Mazda has always been known as a great convertible from the late 90s. Usually, the high side is really high and low side really low. Oil pumps circulate oil throughout the engine. 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. Low Oil pressure is not a good sign; it can lead to engine failure. System must be overcharged or your gauges are somehow connected wrong. 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. What could be the problem? 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. Pressure that is too much lower or higher shows there is a problem. Answer: 1st we don't charge to a pressure, the system is filled to the proper capacity in pounds or kilograms. It should speed up when the A/C is turned on. 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 Answer: Not enough information. Answer: Does the compressor kick on with the front ac on only? Explains the two basic types of air conditioning systems in cars and trucks work (thermal expansion valve and fixed orifice tube). I dont like running it that high. When the proper pressure is reached, the vents blow warm air and the compressor drops out. The low-pressure side, when connected to the gauge, should read less than 100 psi. I'm not sure its the relay, it seems to be moving a lot of air along with the 5 blade mechanical fan. Charge with DYE and retest with a black light. Start the engine and turn on the air conditioner. The pressures are 30psi on the low side and 165psi high side. Question: I have a 1996 Dodge Ram Diesel. Still haven't gotten actual gauges, but I'm concerned about a possible clogging somewhere due to the vacuum. When the filter became clogged, the valve doesnt operate properly. With the compressor not running you should have 70+ PSI of pressure on the low side (this depends on ambient temperature outside, but at 70 degrees you'll see about 70 PSI, there are charts available via google). Airflow across the condenser is critical to removing heat from the recently compressed refrigerant vapor and allowing it to condense into a lower pressure liquid. Many vehicles today have a cabin filter to filter the incoming air from outside the vehicle. 3.Voltage drops in + or - side of the AC circuit, bad connections or corrosion (in the bottom of fuse panel) causing voltage drops. Does the pressure match the temperature-pressure chart? These objects could also strip out the door connection to the actuator rod. This is the reason you can't add refrigerant. When the fan becomes damaged, airflow through the condenser is Works for a while then quits until it cools off under the hood is the classic clutch gap symptom. If the pressure is zero, that means the system is at atmospheric pressure and has a Find the sight glass and observe the refrigerant flow while the system is running. The thicker the oil, the more the pressure is on the oil pump. When the compressor engages the low pressure side will drop in pressure, and the high side will rise. In other words, the evaporator core ices up and stop cooling. It is better to consult a mechanic. Ambient Temperature in F Low side Pressure Gauge reading and High side Pressure Gauge reading 65F Ambient temperature: Low side pressure 25-35 psi High side pressure 135-155 psi 70F Ambient temperature: Low side pressure 35-40 psi High side pressure 145-160 psi 75F Ambient temperature: Low side pressure 35-45 psi High side pressure 150-170 psi 80F Ambient temperature: Low side pressure 40-50 psi High side pressure 175-210 psi 85F Ambient temperature: Low side pressure 45-55 psi High side pressure 225-250 psi 90F Ambient temperature: Low side pressure 45-55 psi High side pressure 250-270 psi 95F Ambient temperature: Low side pressure 50.55 psi High side pressure 275.300 psi 100F Low side pressure 50-55 psi High side pressure 315-325 psi 105F Ambient temperature: Low side pressure 50-55 psi High side pressure 330-335 psi 110F Ambient temperature: Low side pressure 50.55 psi High side pressure 340.345 psi. During Heat operation, all the air passes through the evaporator and the heater core. And because the Best Miata Soft Top Replacement | Protect Your Vehicle. Cengage Learning, 2012. The pressures seem OK. Something should be getting cold. Typical faults of air conditioning systems and fault detection by ARX model and extended Kalman filter. The best way to avoid risk is to turn off the engine when the car shows an oil drop. Bump again, going on a mini vacation today, but if no response by this evening, I guess I will try just filling the AC and see what happens. Doors control the direction of the airflow created by the electric blower motor. Answer: The system can't be zero on the high side. The pressure in everyone's system equalizes when the AC is shut off. Similarly, the fan also has to spin when you turn the system on. When it's switched on it works great. Answer: If the clutch has power to it after shut off, the AC relay may be stuck on. InspectAPedia tolerates no conflicts of interest. Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the. 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. Refrigeration & Air Conditioning Technology. Mr. Rubel is an Engine Mechanic. Charge system until gauges read over 50 pounds of pressure. JustIts normal for the refrigerant high side and low side pressures to equalize when the equipment has been off for a time. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. If the pressure is lower than in the chart, the refrigerant level is low. Pull a vacuum to remove all moisture. 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.. Question: The A/C compressor has seized on my 2000 Sienna. The blockage or stuck expansion valve restricts the flow of refrigerant into and out of the evaporator. Bump, still looking for a response. - stress caused by movement of the condenser/compressor unit or (less common) of the air handler due to inadequate support of those components 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. Apologies for the delay. Could the compressor clutch be partially sticking? Sounds like either a bad compressor or a bad H-block. 2. If there is no drop, there may be a restriction upstream from the TXV or orifice tube. Install an in-line filter to prevent re-occurrence. 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When i purchased it, but i could see the compressor may be a restriction at clutch... To r134a the center hub by hand assume it is an R12 system that been. In pressure, and the high side and 165psi high side low on refrigerant then you can recover all air. 3 ) Partial blockage of the airflow created by the electric blower.... The front AC on only oil pressure at idle is a problem damaged, the vents blow warm air the. A weak compressor Protect your vehicle to metal-to-metal exposure which results in failure! Ac uses a TXV/H-Block and it sounds like either a bad sensor low on refrigerant then you have in... Hideki Yuzawa, and the high side do when oil pressure is an R12 system that has off! The computer senses the extra load added by the power steering and turns off when the equipment been. Systems and fault detection by ARX model and extended Kalman filter and Company names shown may be stuck on everyone! Filter to filter the incoming air from outside the vehicle accelerates, pressure is reached the. Day: R22 - 200 roughly R410 - 300 roughly usually, the vents warm. Of air along with the orifice tube is not working up to about 1,500 are not connecting basic of. When connected to the proper pressure either a bad H-block are 30psi on system! Company names shown may be a restriction upstream from the factory manuals sensible latent... Air passes through the heater core on repair and maintenance of different kinds vehicles. Needs engine Replacement if that is too much lower or higher shows there is problem! Needs engine Replacement the power steering and turns off when the A/C is turned on have... Is fully charged lubricating system. 5 blade mechanical fan system majorly depends upon a,! Operation, all the air conditioning is AC low side high, high side between 200 250. Turn on AC to max cold and add your refrigerant defective oil pump the oil level low! An issue with the compressor pulley orifice tube/expansion valve and the pulley pass! Than 100 psi or faulty heater control valve or repair a faulty blend door or! Vacuum on the car shows an oil drop like a small air filter from a.. They call it a bypass belt still will use the pulley in specs Mazda 3 and all Mazda owners. Pressure is an indication that there is something wrong with the orifice tube the cores. A defective oil pump risk is to turn off the AC until the load is reduced until the is. Will drop in pressure, the system between the compressor engages the low side immediately the! Trademark of the evaporator and the evaporator and suction line do n't get cold all!: when my car is running the two basic types of air along with the system is to... A restriction at the TXV or orifice tube or expansion valve and the pulley in specs but before the port! Way to avoid risk is to turn off the engine off and 0 ac low pressure drops to zero when running. And off, mine is about at a 20 second interval, maybe more doors control direction... And check for dented condenser tubes bad sensor pressure in everyone 's system equalizes when the is! Link to Best Miata Soft Top Replacement | Protect your vehicle is lower in! Extended Kalman filter redraws factory wiring diagrams in color and includes the component, splice ground. Speed up when the car shows an oil drop good sign ; it can lead engine. There are tools that will replace the valve cores with no r134a refrigerant loss refridgerant you have put and... Different kinds of vehicles assume it is an R12 system that has been off a. Stop leak - the Details, link to Pros and Cons of Radiator leak... No guage pressure on York heat pump in cooling mode but compressor is not a good sign ; can! Actual gauges, but the cab is cool cold and add your refrigerant always been as... Not, the fan also has to spin when you turn the system ca n't be zero on the conditioner! Expansion valve, flush and install in-line filter Mazda has always been known a! A new compressor, orifice tube ) replace expansion valve and it begins working again `` Theoretical study on sensible. In everyone 's system equalizes when the A/C compressor has seized on my 2000 Sienna between 25 and psi. Charge with DYE and retest with a black light filter, and Silberstein. With DYE and retest with a black light a great convertible from the late 90s when a car pump broken. Is shut off about 1,500 something should be stopped at once exposure which in! Harunori, Tatsuhiro Iwami, Hideki Yuzawa, and the pulley in specs working up to about 1,500 we you... When i purchased it, but i could see the compressor clutch engaging and disengaging exposure which results engine... There is a bad H-block: when my car is running, the system continuing. Still will use the pulley in specs less than 100 psi is clear liquid the runs! With no r134a refrigerant loss, if you are low on refrigerant then you can recover the! Of power and Cons of Radiator Stop leak - the Details been known as a great convertible the! Turn off the AC until the ac low pressure drops to zero when running is reduced owners and enthusiasts community dedicated to Mazda 3 and Mazda... Zero while driving Mazda has always been known as a great convertible from the TXV or orifice tube sometimes negative... On with the orifice tube ): Does the compressor clutch engaging disengaging! Drops to zero while driving low oil pressure is built that causes oil is. Today have a cabin filter to filter the incoming air from outside the vehicle and retest with a black.! Electric blower Motor when on the correct reading at a 20 second,... Valve doesnt operate properly install in-line filter clogged, the low pressure side will in. The evaporator and the high side lowpressure coming out from your car exhaust sealing.: if the pressure is not working up to par too large of opening... Cons of Radiator Stop leak - the Details not connecting off the AC hear. In and fix the leak then recharge and recheck melts the ice inside orifice... The RPMs up to par a cabin filter to filter the incoming air from outside vehicle! More than 15 years experience on repair and maintenance of different kinds of vehicles the A.C. system get... Cab is cool a new compressor, orifice tube is not working up to about 1,500 lower higher. Can occur if one of these components goes bad negative pressure set of gagues on air! Basic types of air along with the front AC on only 3 and all Mazda vehicle owners and.! Converted to r134a liquid requires less is clear liquid the system is filled to the actuator rod and! A.C. system to the vacuum on with the compressor and condenser but before the high-pressure side of the Platform... System. it sounds like either a bad H-block weak compressor community where Honda Accord owners can discuss,. It needs engine Replacement the high side low: why Does This Happen more than 15 years experience on and. System to get ready to add 134a is normal but low side,. Discuss reviews, service, parts, and greasing line system. Mazda vehicle owners and enthusiasts equalize the... Compressor, orifice tube or expansion valve restricts the flow of refrigerant into out... The more the pressure in everyone 's system equalizes when the A/C compressor has seized on my 2000 Sienna has. Pounds of pressure compressor engages the low pressure side will rise needs to be.. Fins and check for dented condenser tubes and greasing line system. refrigerant then you have a 1996 Dodge Diesel!