Question about 2003 Chevrolet Avalanche
Recently, my air conditioning has been going through phases of blowing hot air when I have the temperature control turned to the lowest setting. Then all of a sudden the cold air will start blowing again sometimes if I turn the a/c off for a while. Also, along with that, the temperature read out on the rear view mirror keeps changing by 20 degrees at a time.
My A/C works a little better than Abolts. Instead of being smart, it seems like mine is A/C's computer is a bit stupid. I am used to very good ones that when I set it to 72, and it is 74 otuside, they don't do a lot. The avalanche will still freeze me out. But if I turn it off, the darn thing actually lets hot air through ( I woudl prefer no air at all, unless a "vent" option had been chosen). Or if it is 69 outside, again I expect very little, but I get over blown with the heat. Everything seems to work, just with very little modulation.
There are other gremlins in there too, liek I think it is having trouble figureing out where o deliver the air. Heat shoudl come in low, but it is still coming in through the dash. I am not sure if it si because the damper to move it low has a problem, or if it is because the comptuer knows that air should be so hot.
Is there some resistor thats getting old and needs to be replaced? If you think you know, please provide part numbers.
Thanks, Scott Mobile, AL
I would check your presure sensore on your A/C lines first, they are cheap and easey to replace, but what it actualy sounds like to me is a bad dryer. which means more money and evacuating the system and replacing the seals. You should not be charged for any freon or R134A as they are calling it now. because they are not replacing that. They are only pulling it out and putting it back in. but the Dryer on the other hand, can be expensive, its that large silver oval shaped object in the back of your vehicles enjine up top. When it goes bad it will do egsactly what yours is doing, then completely stop once it cant go any more. Its caused by a bad seal or usually over years of taking moisture out of the system. so you more than likely have a bad seal some where. good luck. Any other questions you can contact me, if you have the tools I can walk you threw the fix.
Posted on Dec 01, 2008
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Posted on Jan 02, 2017
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