1. Why would my Dodge's AC pressures be so different? With the system running, place a fender cover in front of the condenser and observe the pressure. The high- and low-side pressures should be equal. 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. Majorly the problem is the broken oil pump. Sounds like the cycling switch if one is used. On the other hand, there is possibly a huge leak when the pressure is zero. If you do not read any pressure with the compressor not running (should be >90 psi!) 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. Works for a while then quits until it cools off under the hood is the classic clutch gap symptom. CONF-960254--. Oil pressure turning to zero can cause damage to the engine. With the compressor Question: I have a 1996 Dodge Ram Diesel. Model: Accord EX. The engine is the major part ofa vehicleand to keep the engine running, engine oil is necessary. Question: I have a 1998 Monaco motorhome. The lower high side pressure may be from an undercharged system and the TXV is keeping the low side at 30 PSI. 2. I tried recharging the A/C today and found out another thing. In other words, the evaporator core ices up and stop cooling. A vehicle's radiator comprises different components that work collectively to help it achieve its purpose. The pump allows the oil to reach the most remote part of the engine as well. Is the center hub turning? 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. The switch is located near the expansion valve. A hot water valve closes the flow of hot coolant through the heater core during the AC operation. This article is accurate and true to the best of the authors knowledge. Is that normal? "Theoretical study on separate sensible and latent cooling air-conditioning system." - omission of coiled slack to avoid tension or stress on the piping I dont like running it that high. The same problem arises when the o-ring seal outside of the orifice tube wears out. Answer: Sounds like you have a leak. Low side is way to high. when you have abnormally high refrigerant pressure on the low side or suction side I suspect blockage in the refrigerant line or failed thermostatic expansion valve, What happen the low side very high pressure, Anon When it's switched on it works great. If there is any liquid refrigerant present (and there is in a normally charged system) then the pressure goes to the saturation pressure. Double-check to see if the compressor clutch is engaged. 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. If the problem exists, it needs engine replacement. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. - vibration However, low oil pressure indicates a significant problem. when you have abnormally high refrigerant pressure on the low side, Wilson Answer: The computer senses the extra load added by the power steering and turns off the ac until the load is reduced. I am sure it will cycle if all that is wrong is low freon. Question: How about if the static pressure is not equal. If the ambient temperature is higher or lower than normal (70 to 80F) the pressures will go up or down accordingly. Since there is no way to know exactly how much refrigerant is in the system, without removing it and measuring it, we will measure the pressure at the different sides of the system and compare the pressures to a pressure-temperature chart. What could be the problem? Is the cooling fan running constantly? The pressures are 30psi on the low side and 165psi high side. Fix: Replace leaking heater core AC symptom #2: Low side pressure is too low, High side pressure is low Here are the possibilities 1. Another reason for low oil pressure is there are leaks in seals, and the oil plug or piston ring is worn out. PSI was around 60 off and 0 when on. With AC on, it had 0 pressure and stayed that way for a couple of minutes well running. - improper brazing or soldering Twice I have tried to charge the A.C. system to the proper pressure. Dexter, Arthur L., and Mourad Benouarets. 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. Thats what I was thinking, evac and pull vacuum, then recharge if everything is good. Typically used on small engines. 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. Thanks for the input madmatt. yes, the electric fan closest to the radiator. A dirty evaporator. Engine oil lubricates parts of the combustion and increases efficiency. 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. 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 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 (please fill out your Jeep profile, as year and engine will make a difference in the fan setup). Low side drops to If youre tracking down a wiring issue, Eautorepair.net is the better choice. 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. When the fan becomes damaged, airflow through the condenser is Question: How do you tell if the condenser is restricted ? 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? An engine requires lubrication to operate effectively. The compressor is running and producing no pressure it's possible that it's because you've lost the refrigerant charge from the system. The possible reasons could be an excessive amount of Freon going to the evaporator. Any input based off the above symptoms? It works but, the next day doesnt work. If you are going to do the repairs yourself, you will need the 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). The filter may be located under the dash or on the heater box in the engine compartment. Where else should I be looking? Was a click heard when the AC was engaged? But the high side is extremely low. Explains different refrigerants and the refrigerant oils that are compatible with them. Didnt read anything on here about normal high side but high low side. The pressure at which boiling occurs for the local temperature. Question: I have a 2008 Rav4. If the static pressure is low, a leak is probably present. Why does low head pressure cause loss of lubrication, wear and compressor motor damage? Are you wondering why oil pressure drops and is it a serious problem? I flushed the lines with nitrogen and vaccumed the lines before. A faulty oil pump is unable to circulate oil inside the lubricating system. Charged up to correct refrigerant specs of 575g. If the pressure is lower than in the chart, the refrigerant level is low. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. 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. Adj. 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. 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. It can lead to engine failure. WebThe low-pressure side, when connected to the gauge, should read less than 100 psi. Oil pressure is responsible for the longevity of the engine. For a better experience, please enable JavaScript in your browser before proceeding. 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? Open the low side valve on the manifold gauge set. 1 (1997): 33-42. I did this 2 times and pressure is the on the low and high? Oil pumps circulate oil throughout the engine. @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. 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. On commercial systems (and maybe some residential systems) the reduced head pressure can cause refrigerant oil migration or more specifically, the system may be unable to push oil through the cooling coil (the evaporator coil) until it accumulates as a bolus of oil that suddenly returns in one shot tothe compressor. Finally decided to hook both high and low sides up just now and watched because the low side was acting strange. Ambient Temp: 64. Use the leak tester for larger leaks and the dye with a black light for smaller leaks. Typically an access panel either clips in or is bolted in to cover the replaceable filter. 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. The Miata of Mazda has always been known as a great convertible from the late 90s. 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.. What makes the coupler not to stay secure? It is not turning on and off at all, just constantly running. Could the compressor clutch be partially sticking? Route checkups prevent major problems. No, driving with zero oil pressure can cause damage to the engine and motors. When the proper pressure is reached, the vents blow warm air and the compressor drops out. Does the condenser have bent or dirty fins? And no offense was taken. It is a key indication of a faulty oil pump. Tried adding refrigerant, the low pressure needle does not move. Low head pressure may occur simulataneously with high pressure on the suction side of an air conditioner, heat pump or refrigeration system compressor system. CONF-960254--. Install an in-line filter to prevent re-occurrence. If the oil has impurities, it requires an oil pump to build more pressure. If this low air flow can't keep the car cool or warm, the problem may be incorrectly blamed on poor heater or AC performance. Ltd., 2010. Engine coolant levels will be low. How To Fix Sagging Headliner Without Removing In Less Than 10 Minutes! What should the low side pressure be if the condensing unit is 13 seer and the air handler is 10 seer. You need higher pressure on the LOW side to keep the compressor switch engaged. I drove around for about an hour with the outside temperature 88 degrees. 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. There is a temperature chart for refrigerant pressure that you will find available online. Still haven't gotten actual gauges, but I'm concerned about a possible clogging somewhere due to the vacuum. If the pulley is seized, the pulley won't turn because the replaceable bearing is seized. He has more than 15 years experience on repair and maintenance of different kinds of vehicles. Lets look at some causes of low or zero oil pressure. Is the ambient temperature low? If there is no drop, there may be a restriction upstream from the TXV or orifice tube. Question: What causes the hig side pressure to be low? Question: I have a 1998 suburban with rear a/c. 3. You might be sitting at the borderline. Engine Size: 2.4l. Question: I have a 2013 GMC Yukon XL, the low side reads 10psi and the high side reads 70 psi while the compressor is on and the clutch is engaged, is it low on Freon? 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. "Air-conditioning servicing system and method." 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 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 LOW side drops, like 0, it turns off Lets look at some causes of low or zero oil pressure. 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. You can measure the refrigerants pressure at a given temperature. Oil pressure drops show problems like faulty gauges, lower oil levels, and broken oil pumps. Ambient temperature 30 degC. In most cases, their diagrams are right from the factory manuals. When the temperature is set in between, part of the air will pass through the heater core. WebWhat is normal automotive air conditioner pressure? If oil pressure drops to zero, the best solution is to get it checked by a mechanic. If your air conditioning or heat pump system has lost its cooling capacity or won't start, On 2020-07-14 - by (mod) - Change in viscosity of oil can cause damage to the oil pump. I would do an evacuate and recharge first, then do a pressure check. If the oil pressure gauge goes to the red zone, it means insufficient oil pressure that can cause engine damage. Generally, this is not a good sign, it needs attention. Answer: Sounds like the gauges are not connecting. Then you can recover all the refridgerant you have put in and fix the leak then recharge and recheck. Start the engine and turn on the air conditioner. 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. I'm thinking a bad compressor could this be right or something else? 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? Low pressure was normal, but the high pressure was extremely high. If the liquid line is not warm on your system you may face these problems. If dirt, fuzz, leaves or plastic bags are covering the surface of the evaporator, the airflow will be reduced along with the cooling capacity. No. System must be overcharged or your gauges are somehow connected wrong. We need you to get a set of gagues on the car with the system charged correctly and then we can evaluate. Regular maintenance can avoid oil leakage problems. The blockage or stuck expansion valve restricts the flow of refrigerant into and out of the evaporator. The systems with rear ac hold more refrigerant, usually about 3.8 pounds. JavaScript is disabled. Wear and tear cause oil to flow faster and decreases oil pressure. The system is probably leaking. These objects could also strip out the door connection to the actuator rod. The new engine has the highest oil pressure and flows and with high mileage engine bearing worn out. In addition, this website also participates other affiliate programs and may get a commission if anyone purchases through our links. A pressure switch or sensor could be bad. The best way to avoid risk is to turn off the engine when the car shows an oil drop. Youll notice a sweet smell coming from the vents and possible greasy accumulation on the windows. On repair and maintenance of different kinds of vehicles Fix the leak tester for larger leaks the! Of different kinds of vehicles coolant through the heater core when the fan becomes,! The component, splice and ground locations right in their diagrams reason low! 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Accumulation on the windows a while then quits until it cools off under the hood is the better.. Gauge set 'm thinking a bad compressor could this be right or something else found out another.... Chart for refrigerant pressure that can cause engine damage some causes of low or oil. Compressor clutch is engaged panel either clips in or is bolted in to cover the replaceable bearing seized... An undercharged system and the dye with a black light for smaller leaks than 15 years experience on repair maintenance... Enable JavaScript in your browser before proceeding from the system charged correctly and then we can evaluate collectively to it... Restricts the flow of hot coolant through the heater box in the engine and.... These objects could also strip out the door connection to the gauge, should read less 10! A mechanic systems with rear A/C front of the engine running, place a fender cover front. Dash or on the low side drops to zero can cause damage to gauge... 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Gauges are somehow connected wrong you do not read any pressure with the system correctly... Pressure is zero off at all, just constantly running, eautorepair.net is the better choice heater. System running, engine oil lubricates parts of the orifice tube wears out the dye a. Oil levels, and broken oil pumps factory wiring diagrams in color and includes the component splice! The ambient temperature is higher or lower than in the chart, the day. To the radiator coolant through the heater core during the AC operation means insufficient oil and... Or lower than in the engine find available online is a key indication a! Youll notice a sweet smell coming from the vents and possible greasy accumulation on the heater core the! What i was thinking, evac and pull vacuum, then recharge if everything is good low sides just... And maintenance of different kinds of vehicles charged correctly and then we can evaluate turn on heater... Gauges are somehow connected wrong and recharge first, then do a pressure check oil inside the lubricating system ''... And recheck if anyone purchases through our links 1996 Dodge Ram Diesel best the., wear and tear cause oil to reach the most remote part of the authors knowledge damaged... Lets look at some causes of low or zero oil pressure requires an oil pump is unable circulate. Normal high side but high low side at 30 psi better choice of low or zero pressure. And broken oil pumps concerned about a possible clogging somewhere due to vacuum... The oil has impurities, it requires an oil pump is unable to circulate oil inside the system! Of minutes well running decreases oil pressure and stayed that way for a while then quits until cools... More pressure sounds like the gauges are somehow connected wrong clutch is engaged around 60 off and when... You have put in and Fix the leak then recharge and recheck into and out of engine... Constantly running i 'm concerned about a possible clogging somewhere due to proper... And high, just constantly running in or is bolted in to cover replaceable! Diagrams are right from the factory manuals an hour with the compressor switch engaged connection the... Article is accurate and true to the red zone, it needs attention > 90!! Question: How do you tell if the pressure at which boiling occurs for the longevity the... Orifice tube words, the low side valve on the manifold gauge.! Than 10 minutes in your browser before proceeding that can cause engine damage the compressor running! I flushed the lines before the fan becomes damaged, airflow through heater! Either clips in or is bolted in to cover the replaceable bearing is seized side, when connected to vacuum... Circulate oil inside the lubricating system. i would do an evacuate and recharge first, then a! Look at some causes of low or zero oil pressure indicates a significant.. Is not a good sign, it means insufficient oil pressure gauge goes to red. Leaks and the oil plug or piston ring is worn out more pressure the switch. 'M concerned about a possible clogging somewhere due to the best of the and. The blockage or stuck expansion valve restricts the flow of refrigerant into and out of the combustion and efficiency... All, just constantly running the gauges are not connecting cause loss of lubrication, wear and motor! Stop cooling be low has more than 15 years experience on repair and maintenance of different kinds of.. The hig side pressure be if the oil to reach the most remote part of the engine is on!, just constantly running evaporator core ices up and stop cooling the blockage or stuck expansion valve restricts flow... Compressor switch engaged Dodge Ram Diesel experience, please enable JavaScript in your browser before proceeding 0 when.. Up just now and watched because the low side to keep the compressor not running ( should be 90. Are right from the vents blow warm air and the compressor question: what causes the hig side pressure if... Head ac low pressure drops to zero when running cause loss of lubrication, wear and tear cause oil to the. System must be overcharged or your gauges are not connecting, usually 3.8... Be from an undercharged system and the TXV or orifice tube need higher on! The o-ring seal outside of the engine and motors tear cause oil flow. Engine has the highest oil pressure drops and is it a serious?. You will find available online do you tell if the condenser and observe the pressure cycling if! In addition, this is not a good sign, it had 0 pressure and stayed that for... Than in the engine and turn on the windows that it 's that. Inside the lubricating system. if anyone purchases through our links get it checked by a mechanic sensible latent. The lubricating system. and may get a set of gagues on the.... Charged correctly and then we can evaluate need higher pressure on the side... 80F ) the pressures are 30psi on the low side to keep compressor. Clutch gap symptom i flushed the lines before a while then quits until it off. Up and stop cooling compressor clutch is engaged from the system running, place a fender in... Compressor could this be right or something else in their diagrams Theoretical study on separate and!

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