Question about 1998 Volkswagen Jetta

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Cool at idel speed warm at highway speed Low side at 50 psi. Wont change with rpms or when adding freon!

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See the diagram attached. You must have some Leak. God bless you
cool at idel speed warm at highway speed Low side  - f806dfd0-b805-4bb8-b8dd-d681a52ac962.gif

Posted on Jul 28, 2013

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Posted on Jan 02, 2017

johnf1aresti
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SOURCE: 2000 vw Jetta ac not cooling, ac compressor is on, freon level good, with ac manifold gauges high and low side fluctuates from 50-60 psi on low side.

try to throw cool water on the condencer front of the engine radiator and see whether any cool air comes in the car. If so see whether the pressure valve is working okey or not because might the pressure is not sufficient.

Posted on Sep 05, 2012

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98 expedition with dual air. pressures were 50 and 225 at idle at 90 - 95 deg outside. Compressor cycled and air got warm when driving. Added 12 OZ of freon. pressures went 60 and 250. added another can...


sounds like the expansion valve or the orfice may be clogged is your compressor making noise like a clinging inside if it isyou'l need to change the accumlator dryer as well as expansion or orfice along with the compressor. you could try what are the pressures with a fan in front of the vehicle if they go to 35-40 psi on low side and 200-250 psi on high side these are close to where they should be.

Jul 07, 2012 | 1998 Ford Expedition

1 Answer

1999 Ford Ranger AC low side pressure reads 100 psi


Was the a/c compressor running when you got this reading?

Feb 03, 2012 | Ford Ranger Cars & Trucks

1 Answer

Ac blows cold air for about 15 minutes then starts blowing warm air then starts blowing cold air again freon is full


Freon is not full. If it goes back and fourth it is pumping then reaching a low pressure on the low side below 35 psi. Pressure while car is off should be pegged. Check at idle should be around 50 psi and 35 psi at 2000 rpms.

Good luck. If problem persists evac system replace dryer and recharge.

Oct 21, 2010 | 1983 Mercedes-Benz 300-Class

2 Answers

Air conditioner does not cool in 2000 Yukon.How do I check freon level and how to replace freon if need be


Get an r134a refrigerant add kit from Walmart or your local auto parts store.

You can even get a can of Arctic Freeze by Intermatics that has a hose and a gauge on it.

Connect the hose to the low side port. You can find this port on the 'thicker' piping that comes off of the compressor (versus the thinner piping that comes off the compressor which is the high pressure side).

Pressure should read 25 psi to 45 psi on the low pressure side when the compressor is running and the a/c is on.

Pressure should read 75 psi to 100 psi on a hot day when the car is off.

However, you'll want the a/c to be running when you add freon.

Press the button on the can to install more freon, if needed.

Aug 19, 2010 | 2000 GMC Yukon Denali

1 Answer

Air conditioner compressor runs - freon is up to proper level....not cooling??


BOTH High and low readings should be checked to have a better idea of what is going on with an AC system but based on the limited information… the compressor is not engaged or is not pumping. Below are some things I would check;

1. Check the high and low gauge readings with the AC on & set on MAX/Recirculate, middle vents with the engine at 2,000 RPM’s, blower speed on high.

2. Check the vent temperatures with a thermometer from the middle vents, far right & far left vents?

3. What is the outside temperature at the time the readings were taken?
4. Check to see if the condenser fan blowing strong?

5. Notice if compressor clutch is cylcling excessively.
Could be overcharged, not enough air going across condenser fins, compressor not pumping sufficiently… BOTH gauge readings are really needed to get a better idea.
Below are normal car AC pressure readings with 134A.

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

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

Thank you for using fixya and good luck, keep me posted. Be glad to help you get your A/C running again soon.

Jun 12, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

AC comes on, then shuts down before car is cooled. Compressor activates and blows cool air for about 15 seconds then shuts down.


Low on R134a, you need to have the system recharged. Try to stay away from the do it your self kit that most Auto Parts store carry.
Below are normal car AC pressure readings with 134A

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

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.

Thank you for using fixya and good luck.

http://www.freeautomechanic.com/airconditioning.html

Jun 12, 2010 | 1998 Cadillac Eldorado

1 Answer

1998 olds A/C will only cool on the highway and at idle get warm? i have hooked up a gauge ti the low side and it reads about 100 psi. i have tried to add freon but it wont take. i cannot hear the clutch....


ur gass reading is good....
but on my view ur gas expires have u got reading when it pumped.after more than 2 year the gas is expires and doesnot coolling well.. as u says that at highway it cools when the engine get average race the compressor also race upon the engine and get compression right(at high speed) but at low average speed it not work because the gas doesnot compress properly due to gas expiry.....
check new gas......i think u r compressor is good enough if it cools at any time....if compressor dead then it doesnot coll at any time....because the compression valve varssuls are down at bottom......


i think my idea will healp u...good luck.

Aug 23, 2009 | Oldsmobile Aurora Cars & Trucks

2 Answers

96 Tahoe no Cold Air


YOU NEED 28 PSI ON LOW SIDE AND ABOUT 190 ON HIGH SIDE.YOUR REFRIGERANT IS LOW THAT WHY COMPRESSOR CYCLING ON AND OFF.

Jul 22, 2009 | 1996 Chevrolet Tahoe

1 Answer

Ac compressor took one can of freon will not take other also it still is not cool


You may have over charged the system, An over charged system will also give you poor A/C performance and worst can lead to expensive repair if the compressor get's damaged.
 With the AC on the coldest setting, use a thermometer in a middle vent. Normal vent temperature readings will vary depending on the (ambient) outside temp. The vent temperature should range from around 42-55 degrees in my experience. If normal gauge readings are obtained and the vent air is cold - STOP don’t overcharge the system. The only proper way to remove refrigerant is with a AC recovery machine so if this is being done at home I can’t emphasize enough not to over charge the system. And actually the best way to insure the proper charge is in a system, is to use an AC machine to recover the freon and then evacuate and recharge the system with the correct amount. Most cars have the specified amount on a decal under the hood. 
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.

God luck and hope this helps. 

Jun 30, 2009 | 1994 Ford Escort

1 Answer

AC blow out hot at low rpm


when you are stoped does the car idle fine. when the rpms are low the compressor does not get the pressure up high enough. you may need to get you idel turned up a little or your vaccume advance may have a vaccume leak.

Jun 24, 2009 | 2004 Saturn VUE

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