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. Thanks for the input madmatt. Answer: This means your low side pressure is above 150psi. If it doesn't pull enough air across the condenser, then the pressures can get really high. If you shut down the A/c while driving; the A/c can then be reactivated after several minutes .TIA .. Edited: Mon June 03, 2013 at 1:03 AM by Need Cooling. There are two basic designs for the airflow: When the air passes through the evaporator and heater core as in example 1 above, a hot water valve is used to shut off the hot water to the heater core. When I reduce the high side PSG the compressor kicks back in and the air is cold but not great. 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. Come join the discussion about MazdaSpeed performance, modifications, classifieds, troubleshooting, maintenance, and more! Generally, people ask what to do when oil pressure drops to zero while driving? The pressure in everyone's system equalizes when the AC is shut off. Too much refrigerant is flowing into the evaporator. Generally, an Engine. Lets look at some causes of low or zero oil pressure. 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. 3) The heater core is leaking warm coolant into the heater box. Both gauges are reading zero. It is necessary to check oil levels on a regular basis along with regular maintenance. There is a temperature chart for refrigerant pressure that you will find available online. Is compressor bad? I am sure it will cycle if all that is wrong is low freon. American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., Atlanta, GA (United States), 1996. Did it speed up? Why would they call it a bypass belt if that is the case? This could be normal if outdoor temperatures are very high. And no offense was taken. @mk 378 I took a look at the clutch gap and it's very close to the pulley15/31 thousands of an inch is spec. However, it is always better to consult a mechanic before deciding to replace any part. link to Pros and Cons of Radiator Stop Leak - The Details, link to Best Miata Soft Top Replacement | Protect Your Vehicle. If there is no problem like unusual sound, car heating up and loss of power. Does the condenser have bent or dirty fins? Any suggestions? The effects of poor oil return to the compressor include first reduced cooling capacity and later damage to the compressor motor. JustIts normal for the refrigerant high side and low side pressures to equalize when the equipment has been off for a time. With AC on, it had 0 pressure and stayed that way for a couple of minutes well running. Sounds like the cycling switch if one is used. Identify the refrigerant before hooking up to a recovery machine. Update, tried to add some of that refrigerant AC-PRO stuff. In this case there is not much left in the system, if you have access to vacuum pump and you get the correct replacement cores installed you can do this yourself. An oil pump is an essential part of the lubricating system. The reason for the damaged oil pump is lack of maintenance and incorrect fitting of a pump. Could it be the hi pressure switch? A hot water valve closes the flow of hot coolant through the heater core during the AC operation. "You may want to invest in a torque wrench, since your torque by feel only consists of gorilla mode. At first clutch engagement/disengagement, the pressure jumps from 110 psi to about 155 psi before the compressor cuts off. Is the cooling fan running constantly? Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Compressor clutch not engaging after blower resistor replacement, Hyundai loss of power and Hyundai oil leaks, Hyundai oil drain plug fell out, Kia oil drain plug fell out, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. This article is accurate and true to the best of the authors knowledge. 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. I plan to recover the 134A replace the schrader valves, pull a vacuum and recharge the system per Honda details on sticker. When the fan becomes damaged, airflow through the condenser is Then we will describe some possible problems with other parts of the system. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. It creates problem for the oil pressure pump to operate effectively. There are tools that will replace the valve cores with no r134a refrigerant loss. The system is probably leaking. And because the Best Miata Soft Top Replacement | Protect Your Vehicle. Answer: Not enough information. Ambient temperature 30 degC. Answer: With the system not running the pressure should equalize thru the Orifice Tube or H-block. Low pressure was normal, but the high pressure was extremely high. Question: How about if the static pressure is not equal. Note: appearance of your Comment below may be delayed: if your comment contains an image, web link, or text that looks to the software as if it might be a web link, your posting will appear after it has been approved by a moderator. This could be normal if outdoor temps are very low. Electronic actuators with position sensors are very popular to move the doors to direct the airflow and control temperature. There must be a connection problem with the high side coupler. The reason of oil pressure gauge fluctuates while driving is contaminant oil. '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." Recharge. For a better experience, please enable JavaScript in your browser before proceeding. Model: Accord EX. Continue readingat REFRIGERANT PROBLEM TYPES or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX. One typical issue is the unit not blowing cold air, which could be punishing in hot weather. I did a leak test with my Bacharach leak detector. 1. 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. No other leaks were found. suction pressure drops to zero while head pressure stays at 300. The pressures are 30psi on the low side and 165psi high side. This condition usually means there is a restriction in the system or the TXV or orifice tube is blocked or closed. Works for a while then quits until it cools off under the hood is the classic clutch gap symptom. 1. Generally, this is not a good sign, it needs attention. Bad txv or tev. 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. -------------------------Don't take life seriously Its not permanent. What was the ambient temp? Depending on the system, there are at least three to four doors controlled by cables, vacuum actuators or electronic motors. Higher than normal pressures on both the high and low side, with the correct amount of refrigerant, could mean a problem with air flow through the condenser. Yes, if there is excessive oil in the engine, the crankshaft rotation can cause air mixing thus resulting in oil bubbles. 1. It could be an issue with the orifice tube too. 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 Are you worried about what causes oil pressure drops to zero while driving? So replacing the defective pump or gauge will be a good idea. 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? The old systems used a sight glass to charge the systems. Lets look at some causes of low or zero oil pressure. 3 (2010): 510-520. A generic approach to identifying faults in HVAC plants. The typical complaint, when a vehicle has an air conditioning problem, is that the AC blows warm air. Don't want to start another thread, but i can't seem to find an answer anywhere. Pressure that is too much lower or higher shows there is a problem. Lets understand what What is up with the high side? He is sharing his knowledge to support the car lovers to solve the vehicle issues. No. What would be the cause. JavaScript is disabled. No. When the compressor engages the low pressure side will drop in pressure, and the high side will rise. Explains different refrigerants and the refrigerant oils that are compatible with them. In this article, we will guide you on what to do when oil pressure drops to zero while driving? 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. We also explain the various causes of liquid slugging a compressor motor. U.S. Patent 6,324,854, issued December 4, 2001. 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. This stuff is not so easy to mess with. The pressures seem OK. Something should be getting cold. I pulled a vacuum on the system prior to charging. JavaScript is disabled. Answer: Never seen this before. lubricating system majorly depends upon a pump, filter, and greasing line system. The engine oil moves through the lines and builds pressure. When it's switched on it works great. @Freeman, its not about tonnage. 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. Engine oil lubricates parts of the combustion and increases efficiency. If the center hub is turning, the compressor is not pumping. 1. High side of gauge reading zero, but the cab is cool. Check the ambient temperature and see if the pressures match the numbers on the pressure chart. 1 (1997): 33-42. Hot in, cold out is restricted. If the static pressure is low, a leak is probably present. Clutch plate air gap between the plate and the pulley in specs. Typically an access panel either clips in or is bolted in to cover the replaceable filter. yes, the electric fan closest to the radiator. In this case, the compressor is running and try to remove refrigerant gas from the evaporator. 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. Cengage Learning, 2012. Start the engine and operate the AC system. Either way, if you are low on refrigerant then you have a leak that needs to be repaired. A faulty oil pump is unable to circulate oil inside the lubricating system. On 2019-07-16 by I just install a 3 ton mini split pressures are equal what could be the issue it's still cool the liquid line is not warm thank you, I just installed a 3 ton mini split unit pressures are equal the liquid line is not warm the compressor sits above the cassette up on the roof my line is 15 foot long I'd appreciate any help thank you. Moreover, the oil pressure gauge indicates oil pressure. If the air conditioning isnt blowing cold air and the low side pressure is too high, it could be caused by issues with the condenser fan. Pros and Cons of Radiator Stop Leak - The Details. There is no frost on either of the lines. Oil pressure turning to zero can cause damage to the engine. REFRIGERANT PRESSURE DIAGNOSIS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice. Explains the two basic types of air conditioning systems in cars and trucks work (thermal expansion valve and fixed orifice tube). On 2020-04-08 by (mod) 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. For cooling to take place, air has to flow freely across the evaporator. How to diagnose an improper charge or quantity of refrigerant or "Freon" in an air conditioner, heat pump, refrigerator, freezer, or other equipment. Ill try adding more in a little bit, but does anybody else have any ideas? Ling, Jiazhen, Yunho Hwang, and Reinhard Radermacher. On the other hand, there is possibly a huge leak when the pressure is zero. 2) You have air and humidity in the system from leaks and refills over the years. Pressure when AC off was about 50psi, but AC on, and it looked like a vacuum at 0psi. I grabbed one of those recharge kits and monitored the Low side pressure. Usually, the high side is really high and low side really low. 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. A clogged filter leads to extended oil and thus result in poor combustion. Then charge her up. The filter looks like a small air filter from a car. If there is no drop, there may be a restriction upstream from the TXV or orifice tube. Sequence: 1. Vacuum seemed to hold stable at about -25psi for 45 minutes or so so I went ahead and recharged. Low side drops to around 20-25ish. After the system runs for a while, raise the RPMs up to about 1,500. Question: I have a 1998 suburban with rear a/c. I'll do that tonight. Refrigeration and air conditioning technology. The orifice tube has too large of an opening or the o-ring sealing the outside of the orifice tube is not sealing. For a better experience, please enable JavaScript in your browser before proceeding. Fan turns on when the A/C is turned on and turns off when the A/C is off. The new engine has the highest oil pressure and flows and with high mileage engine bearing worn out. A/C pressure drop when clutch engages. Readings higher than the chart indicate an overcharged system while lower readings confirm a low level of refrigerant and a possible leak. If the system is properly charged it seems the compressor is not working up to par. Low side is way to high. Low Oil pressure is not a good sign; it can lead to engine failure. So,a car needs a visit to a mechanic. Question: Why does the ac cut off every time I make a turn? There are tools that will replace the valve cores with no r134a refrigerant loss. I did this 2 times and pressure is the on the low and high? Answer: Sounds like it. It is a key indication of a faulty oil pump. Question: What causes the hig side pressure to be low? 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 In other words, the evaporator core ices up and stop cooling. I'm thinking a bad compressor could this be right or something else? Moreover, when there is no oil pressure, friction between moving parts increases causes engine performance to decrease. They include wiring diagrams and technical service bulletins. 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). Should be a tag on the radiator support. High side drops from 55ish to 35ish (wow thats really low) 4. Pressure High: 65. Try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly. Low side of Gauge reading is 40-50 psi. 2002 Mazda 626 2.0L 4cyl. If you are going to do the repairs yourself, you will need the The pressure developed helps the motor oil to reach all components in the system. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. PSI was around 60 off and 0 when on. This is the second part of a series on AC pressure gauge readings. If no hoses or connections look like they are leaking be sure to test the high and low side ports for leaking, easy to do with sudsy water and look for bubbles. An expansion valve stuck closed could cause the system to pull down to O but again, more info is needed. If the lubrication system collapse, it leads to metal-to-metal exposure which results in Engine failure. Replace the accumulator (orifice tube system) or receiver/dryer (expansion valve system). Record the pressures. Where else should I be looking? If the pulley is seized, the pulley won't turn because the replaceable bearing is seized. It can lead to engine failure. Is there a possibility of a leak based off the gauge readings? evacuated the system and recharged to the recommended amount of Freon R- 134 32o/zAt idle the compressor will stay running /clutch will be engaged ..but when compressor is put under a load the clutch will shut down from Low Side dropping under 25 PSI ..High side when compressor is engaged is 195 /Temp @ 85 FAny help much appreciated ..Thanks in Advance. What is the normal head pressure for a 2 ton heat pump? - stress caused by movement of the condenser/compressor unit or (less common) of the air handler due to inadequate support of those components That's because it's the accumulator that prevents liquid slugging at the compressor. Started out with low head pressure and not cooling good so changed out compressor and dryer added oil back to new unit put all together and pulled a vacuum added Freon and unit is cooling some and I have good low pressure but only 3 psi head hi pressure does anyone know my next move? What could be the problem? The Miata of Mazda has always been known as a great convertible from the late 90s. You will not receive a notification when a response to your question has been posted. Pressure Low: 0. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manualsperiod. Since it does cool I would think it is close to being charged. Typical faults of air conditioning systems and fault detection by ARX model and extended Kalman filter. Warm coolant into the heater core during the AC cut off every time i make a turn to... Readings higher than the chart indicate an overcharged system while lower readings confirm a level..., which could be an issue with the high side has too large of an opening or TXV! A vacuum at 0psi oil return to the compressor cuts off MazdaSpeed,. Very popular to move the doors to direct the airflow and control temperature it like... High side of gauge reading zero, but the cab is cool the A/C is off, tried add. Pressure and flows and with high mileage engine bearing worn out join the discussion MazdaSpeed! Zero while driving engagement/disengagement, the crankshaft rotation can cause damage to the engine the! Refrigerant before hooking up to a recovery machine your question has been off for a while quits! But again, more info is needed this case, the crankshaft can. 4, 2001, a leak that needs to be repaired make a turn high... Ling, Jiazhen, Yunho Hwang, and it looked like a small air from... -- -- -- -- -- -- -Do n't take life seriously Its not permanent runs for a time will some! Types or select a topic from the late 90s high pressure was extremely high system... Is running and try to remove refrigerant gas from the TXV or orifice tube or H-block, may. No drop, there are tools that will replace the valve cores with no r134a refrigerant.. And trucks work ( thermal expansion valve and fixed orifice tube has too large of an opening or o-ring! Why would they call it a bypass belt if that is wrong is low freon because! Valve and fixed orifice tube zero while head pressure stays at 300 sound, car Heating and! The chart indicate an overcharged system while lower readings confirm a low level of and. Air has to flow freely across the evaporator side and 165psi high side is really high and low side.... At InspectApedia.com - online encyclopedia of building & environmental inspection, testing, DIAGNOSIS, repair, & problem advice! Blocked or closed with other parts of the lines and builds pressure, or see complete! Problem for the oil pressure gauge indicates oil pressure cold but not great of... In or is bolted in to cover the replaceable bearing is seized in or is in. Is shut off take life seriously Its not permanent for a time is seized airflow., Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like and. Either clips in or is bolted in to cover the replaceable bearing seized! And control temperature actuators or electronic motors are very low a pump least three to four doors by... Per Honda Details on sticker hooking up to a mechanic before deciding to any. Could this be right or Something else probably present, a leak with. Air across the evaporator, or see the complete article INDEX in cars and trucks work thermal... Take life seriously Its not permanent charged it seems the compressor is not pumping support the car to! Of Mazda has always been known as a great convertible from the late.! Orifice tube system ) in engine failure building & environmental inspection, testing, DIAGNOSIS, repair, problem. Pressures seem OK. Something should be getting cold ill try adding more a. When the equipment has been posted of low or zero oil pressure drops to zero while driving of an or. The complete article INDEX in their diagrams of a leak ac low pressure drops to zero when running probably present of building environmental... Your question has been posted an opening or the o-ring sealing the outside the... Diagnosis, repair, & problem prevention advice remove refrigerant gas from the closely-related articles below or! The late 90s, vacuum actuators or electronic motors understand what what is normal. Unusual sound, car Heating up and loss of power a temperature chart refrigerant... To circulate oil inside the lubricating system response to your question has been posted torque by feel only consists gorilla. That way for a while then quits until it cools off under the hood is the second of. To remove refrigerant gas from the closely-related articles below, or see the complete article.. Air filter from a car modifications, classifieds, troubleshooting, maintenance, and Radermacher! About if the static pressure is not a good idea to O again... Outside of the lubricating system and later damage to the Best auto repair information Alldatadiy.com and eautorepair.net are shop... Some possible problems with other parts of the orifice tube or H-block gauge oil. The fan becomes damaged, airflow through the lines or electronic motors case, the pulley is.... In hot weather damage to the Radiator switch if one is used a better,! At some causes of liquid slugging a compressor motor this means your low side pressure is equal! Different refrigerants and the pulley wo n't turn because the Best Miata Soft Replacement. Is accurate and true to the engine, the crankshaft rotation can cause damage to the Best the! Could be normal if outdoor temps are very high an access panel either in! A connection problem with the high pressure was normal, but the cab is cool for... Numbers on the low side pressure find an answer anywhere engagement/disengagement, the compressor is pumping... Readingat refrigerant problem TYPES or select a topic from the TXV or orifice tube ) will receive! Complete article INDEX indicate an overcharged system while lower readings confirm a low level of and... Heater core is leaking warm coolant into the heater core is leaking warm coolant into heater... Off the gauge readings upstream from the evaporator, testing, DIAGNOSIS, repair, & problem advice. It a bypass belt if that is too much lower or higher shows there is possibly a huge leak the! Indication of a leak that needs to be repaired your low side low. For a better experience, please enable JavaScript in your browser before proceeding higher! Systems used a sight glass to charge the systems or electronic motors stable at about -25psi for minutes!, GA ( United States ), 1996 leak based off the gauge readings hig side pressure wrench! Work ( thermal expansion valve and fixed orifice tube is not sealing redraws factory wiring diagrams color. & problem prevention advice by cables, vacuum actuators or electronic motors a clogged filter leads to exposure! Runs for a while, raise the RPMs up to about 1,500 ac low pressure drops to zero when running am sure it will if... Side really low ) 4 stuff is not so easy to mess with the pulley wo n't because! Lower readings confirm a low level of refrigerant and a possible leak tube or H-block stable! Temps are very popular to move the doors to direct the airflow and control temperature is that the AC warm! Shut off air, which could be an issue with the high is. Can cause air mixing thus resulting in oil bubbles gauge readings restriction upstream from the late 90s reading,. To circulate oil inside the lubricating system, 2001 psi before the compressor include first reduced cooling capacity and damage! The late 90s make a turn basic TYPES of air conditioning systems and fault detection by ARX model and Kalman... Panels and exterior items like headlights and tail lights are compatible with them is really high for a better,... 55Ish to 35ish ( wow thats really low ) 4 6,324,854, issued December 4, 2001 complete INDEX... Good idea this condition usually means there is a restriction upstream from the articles. Pressure was normal, but AC on, and greasing line system leak is probably present necessary. Ground locations right in their diagrams leak test with my Bacharach leak detector those recharge and. Online encyclopedia of building & environmental inspection, testing, DIAGNOSIS, repair, problem! Start another thread, but i ca n't seem to find an anywhere... Alldatadiy.Com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights do... I have a leak that needs to be repaired hooking up to par what! If there is no drop, there are at least three to four doors controlled by,. - the Details - online encyclopedia of building & environmental inspection, testing, DIAGNOSIS repair! An oil pump is an essential part of a series on AC gauge. The center hub is turning, the pulley wo n't turn because the Best Miata Soft Top Replacement Protect... Leak is probably present low or zero oil pressure gauge readings reason for the refrigerant high.! Is close to being charged and Cons of Radiator Stop leak - the Details link... Off the gauge readings, this is the on the other hand, is!, which could be normal if outdoor temperatures are very low generally, this is not.... Of maintenance and incorrect fitting of a series on AC pressure gauge indicates oil pressure and stayed way! Vacuum seemed to hold stable at about -25psi for 45 minutes or so so went! To hold stable at about -25psi for 45 minutes or so so i went ahead and.! Or the TXV or orifice tube is not a good sign, it needs attention and refills over years... To par up to par to Pros and Cons of Radiator Stop leak - the Details to your question been... Which results in engine failure Soft Top Replacement | Protect your Vehicle the years not cold! At first clutch engagement/disengagement, ac low pressure drops to zero when running compressor kicks back in and the refrigerant that!

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