Question about 1999 GMC Yukon

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I just put in freon and now it wont give out cool air

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Is the compressor engaging and did it engage before adding freon?
What is the pressure on the gauge for the low side? 25psi to 45 psi is normal when the engine is running and the compressor is turning.

If the compressor is not turning the pressure should read 75psi to 100psi, before the compressor starts turning.

Also, the radiator fan should go on when you engage the air conditioning by turning it up to max.

Posted on Jul 16, 2010

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1 Answer

A/c compressor stopped cooling,clutch is engaged,is it possible to have too much freon in the unit,,


The system needs to be vacuumed down with a recovery machine and the proper amount of oil and freon added to ensure proper operation. The system most likely has air/moisture within it and will not function properly. Have it proffessionally serviced for adequate operation

Jul 05, 2015 | 1993 Mercury Villager

1 Answer

Will no freon prevent me from adding freon if the compressor wont engage without it


Sort of.
If the system is empty, you would need to jumper the low pressure switch to power the ac clutch to put the first can or two of freon in.
Keep in mind the system is supposed to be vacuumed out before adding freon, so if it is full of air you won't be able to put the full amount of gas in.

Sep 28, 2012 | 1999 GMC Suburban

1 Answer

My air conditioner works but does not cool . i have added freon the last two years and fixed the problem ,did the same thing this year but did not help .


When self adding freon after it leaks out you get air trapped in the system. After adding freon a couple of times the air expands not leaving room for the needed freon. To continue adding freon with air tapped will knock the compressor out pretty quickly, there's not enough room for both & the air is keeping the freon from being able to cool properly give the false indication of being low on freon. The freon you are adding has the dye added to assist in finding the leak since freon does not evaporate nor dissipate it its being leaked out. A black light will assist locating the leak. The best thing is to have the unit checked & serviced by a mechanic...he'll charge about $ 150.00 to check for leaks, remove the old freon...his machine will tell him how much air its trapped in the system by how little freon is removed. For the service fee he will replace valves & gaskets, where needed, correcting most leaks. After sucking the system down & recharging the problem should be corrected.

Jul 19, 2011 | 2001 Dodge Ram 2500 Truck

1 Answer

My air conditioner is not blowing out cold air. How much freon do I put in a 2000 GMC Sonoma ?


That all depends how much freon it still has in the system, best way to check is with some a/c gauges, if you put to much it will not cool or could damage some thing, and if not enough will not cool right, used a/c gauges for right amount of freon, now if the a/c system is empty it takes 1.88lbs of 134a freon.

May 27, 2010 | 2000 GMC Sonoma Extended Cab

2 Answers

2004 SATURN VUE HAS PROBLEM BLOWING COLD AIR WHEN SITTING IDLE. IT WILL COOL IF I AM DRIVING AND GIVING IT GAS CONTINUOUSLY. FREON OK. CHECKED OUT BY MECHANIC WHO REPLACED THE "EXPANSION VALVE". STILL...


did you check if the cooling fans are working? this is very important, because they lower the pressure of the freon before passing throughout the expansion valve and getting into the evaporator,more pressure means highter temperature, , of course when you are driving the air flow throughout out the condenser lowering the freon temperature in the condenser and lowering the freon pressure at the high side, tha's way the temperature inside the car is lower ... you can have a similar problem if the condenser is partially plugged..hope this was very helpful...

Aug 05, 2009 | Saturn Vue Cars & Trucks

3 Answers

Ac system does not get cold


you should go to a mechanic and check the A/C if the freon id low it won't cool , some time at mornig it give you the semsation that is cooling but probably not..

Aug 01, 2009 | 1999 Volkswagen Cabrio

1 Answer

Think the a/c has a leak. Put botttles of freon


deifinitely leaking...most likely spot is the condenser and accumulator..could also be at the compressor.

Jun 16, 2009 | 1997 Pontiac Bonneville

1 Answer

AC air is only cool, how do you recharge the compressor?


You can buy a can or,refil kit of R-134-A at walmart however only put the freon in on the low side (read the directions) if the freon gas will not go in; run an 18 gauge wire from the battery to the compressor clutch switch to run the compressor if the freon gas still won't go in it must be evacuated and, recharged by a shop. only put in enough freon to get the system cold any more than that and, you will lose cooling again (over charge)

Jun 11, 2009 | 1997 Cadillac DeVille

1 Answer

Air conditioning not working. Blowing cool air in the back and hot air in the front.


Is there air blowing from the front vents? or can you hear the vacumm change when you change it from heat to cool..... I think it might be a vacumm problem... its a 1997 so the controller vacumm hoses may be cracking.. let us know

Jun 01, 2009 | 1997 Chevrolet Suburban

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