Question about 1990 Lexus ES 250

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A/c low side is -20 high side is 200 what could cause this

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This problem usually faulty sensor ambient air. He then gives the wrong information about the measurement. Can be replaced separately and not too expensive.

Posted on Jul 08, 2010

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Posted on Jan 02, 2017

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2 Answers

Golf 1.4 2003 very high emissions


Replace your oxygen sensors.
murf427

Aug 29, 2012 | 2003 Volkswagen Golf

1 Answer

Overfilled freon


To review - the system only holds 2 pounds max. Each can holds 12 oz.
You could be using the wrong fitting on the car. The low side would show something around 30 or 40 psi and the high side would be over 200 psi. One port is bigger than the other, but some cars have a fill port on the high side for factory use only. The low side is usually mounted on the bigger//fatter hose.
You can leave the can off the hose and slowly open the valve to release the gas. Keep in mind freon gas is about minus 40 degrees so don't let it touch you.

Jun 28, 2012 | 1995 Toyota Corolla

1 Answer

THE A/C PRESSURES LOW SIDE IS 75lbs HIGH SIDE IS 200 AT IDLE HIGH SIDE GOES TO 400 AT HIGHER RPMS BUT A/C NEVER COOLS RITE


High side should never go over 300...Two things that you should fix first....
Check and make sure nothing is blocking the air flow though the condenser no or low air flow will cause high pressure...
Next, (Orifice Tube) you will have to remove all freon to get to it...It may be clogged, and will cause high pressure...
There are more things, but i think, these may correct the problem...Good Luck

Aug 09, 2011 | Hummer H2 Cars & Trucks

1 Answer

Need to know the proper high side/ low side gauge readings when adding freon


The high side should read a little more than 100 pounds plus the ambient temperature. On a 100 degree day the high side will be over 200 pounds. A high side reading of 250 pounds is no problem. The important reading is the low side, and it should always be about 30 pounds. Higher than 30 will produce warmer air, and under 30 will cause the evaporator to freeze up.

Jun 18, 2011 | 2005 Buick LeSabre

1 Answer

Where is the low pressure ac valve?


FOLLOW THE REFRIGERANT LINE LEADING FROM AC COMPRESSOR TO EVAPORATOR TO THE BACK FIREWALL LOOK FOR REFRIGERANT LINE WITH BLACK OR BLUE CAP THATS LOW PRESSURE SUCTION SIDE..WHEN HANDLING REFRIGERANT WEAR SAFETY GOGGLES TO KEEP REFRIGERANT GETTING INTO YOUR EYES.WHICH CAN CAUSE BLINDNESS OR DAMAGE EYES.YOU NEED A LOW AND HIGH PRESSURE GAUGE.OR MANIFOLD GAUGE SET.LOW SIDE PRESSURE SHOULD BE 28 PSI AND HIGH SIDE SHOULD BE 200 - 220 PSI.

Feb 20, 2011 | 1991 Mazda 626

1 Answer

My air condition is not blowing cold air


best diagnostic method is dual head gauges. balanced pressure between low and high side in the off position is aroung 90 lbs. running low pressure is 20-40 lbs and high pressure 160-200, is the compressior not coming on? does it stay on, or click on and off. either might mean the freon level is low. try unplugging the low pressure switch on the low side supply line and shorting the pigtail wires together with a paper clip. does the compressor stay on now? if so and the air is warm or cool, freon is low. if the air is cold that switch is bad. if compressor still won't come on the list of possibilities grows longer: compressor, comp fan clutch, AC relay, restriction at several places... repair shop time...

Sep 04, 2010 | 1991 Buick Riviera

1 Answer

I just finished charging it it's at 100 psi low side tube gets cold right at fill point rest of system does not. Dryer is hot.


100 AT PSI ON THE LOW SIDE TOO MUCH REFRIGERANT.LOW SIDE NEED TO BE 28 PSI. HIGH SIDE SHOULD BE 200 PSI.YOU NEED A MANIFOLD GAUGE SET TO SEE YOUR LOW AND HIGH PRESSURE SIDE.YOU PUT TOO MUCH REFRIGERANT IN AC SYSTEM IT WILL EXPLODE CAUSE SERIOUS INJURY AND DAMAGE THE COMPRESSOR.

Jun 11, 2010 | 1997 Audi A8

2 Answers

AC not cooling


You need to have the system vacuum evacuated, using a vacuum pump and a set of gauges, to verify that it is holding. You also must install EXACTLY the amount or refrigerant that the system calls for. Too much or too little will result in failure.

Sep 03, 2009 | 1995 Geo Prizm

1 Answer

Put a pressure guage on ac line it read 90lb


Normal readings on high and low side with AC OFF (static pressure) - Depends on outside temperature, but normally is between 80-105 PSI Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s - Ranges from 25-35 PSI - Note that on many Chrysler products a normal reading on the low side may be 15-25 PSI Normal high side reading ranges from 200-350 PSI
Don’t assume that if adding little Freon is good that adding a lot is better!  Overcharging just a little can decrease the performance of the system and possibly damage the compressor.

Both low and high side readings are lower than normal, this indicates a cars AC system is low on refrigerant and is under-charged.

If both low and high side readings are too high, this indicates an overcharged system - too much refrigerant. This also can indicate that the condenser fan is not working, is too slow or the car is overheating and heat is transferring from the radiator to the condenser.

When the low side goes so low that it’s reading shows it is in a vacuum, the most likely cause is a bad expansion valve or blocked orifice tube. Another possibility is a restricted condenser. Blocked condensers are not as common as they used to be but if a compressor fails and comes apart inside the remnants can end up in the condenser causing it to restrict the flow of refrigerant.

When the compressor clutch is definitely engaged and the low side is high and the high side is low, the most likely cause is that the compressor is failing - it is not pumping sufficiently. Rarely an AC clutch could be slipping but usually this will be accompanied with a squeal or chirp. Also be sure not to overlook the obvious, like a loose belt!

Hope this helps, keep me posted, be glad to help answer any question you may have. 

Jul 02, 2009 | 1998 Oldsmobile Intrigue

2 Answers

What are the charging pressures for the AC?


they very cause of hmidity and heat ,,,but ,,,about 40-45 on low side,,, and 200- 250 on a hot day for high side

Jun 28, 2009 | 1995 Chevrolet C1500

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