Question about 1998 GMC Sierra

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Wont blow cold air for a/c.

It's actually a 96 1500. I'm guessing I need to fill the freon, but not sure. How do I know for sure. If I do need to fill, how do I do it?

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Here is some good info on a/c systems. how to to recharge is in the list
http://www.aa1car.com/air_conditioning.htm

Posted on Jun 07, 2010

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Did you try to add freon because is was no longer blowing cold air? Who added the freon local repair shop or A/C specialist?

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You've got some of the picture, but not all of it.
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I have a 2004 Trailblazer and my rear a/c starts out blowing cold air but gets warm shortly after but the front a/c keeps blowing cold air all the time???? what could cause that ????


Just a little low on freon can make it get too cold and it freezs if you in position to check the freon level you'll find with the system on high and the engine reved up the low pressure is below 25PSI. fill it to reved up is above 25 and your problem will go away. Low on freon will make it cold enough to frezze up and then warm up as the air does'nt go though the ice. it'll work good as you start up till it frezzes and after it's stopped up with ice it blows warm (it's really too cold). the more freon in the system the warmer it'll all blow because all the pressures are higher and it's the difference in pressures that make it cold.

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1 Answer

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you can get a 134 freon fill kit with a fill hose on it and try to fill it yourself.
do you hear the compressor cycling on and off?if so thats a clear indication of not enough freon .
you say on the drivers side?
does it blow cold on the passenger side.?
if so this is an indication of the air handler not working right.
the freon fix will be easy but if theres an air handler problem its best to be left for the pros at the dealer that are use to working with and have heard of those problems before.
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no one i know rents them as they are very fragile tools.
also you may want to check any and all fuses.
as on these cars 90 percent of all problems on these cars are solved here.that car is way to new to have a freon leak.also check for any service recalls.
hope this helps
keep me posted
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You probably have leaked out your freon after so much time. Try adding some more Freon if it doesnt stay charged you may have bigger issues.

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i need to know how is not cooling the car?
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it probably isnt cold.lets try that.
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go get a 134a fron fill kit not the conversion kit.
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1 Answer

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your high pressure switch is faulty. the part is about 50$

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