Silverado/Sierra: Heat/AC Questions

Silverado/Sierra: Heat/AC Questions

There are 6 comments on the story from Mar 29, 2007, titled Silverado/Sierra: Heat/AC Questions. In it, reports that:

My 1993 Chevy's air is leaking from the low side hose port. It has already been converted to r134. via

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Jim Bowers

United States

#1 Apr 25, 2007
2004 Silverado...heat came from A/C outlet on right side only while A/C only was on. Controls were set to A/c. Later it resumed working correctly. What can be done about it?


Jim Bowers

Houston, TX

#2 Jun 16, 2007
My AC blower works fine, my heater works fine, and I don't have any freon leaks in my system. However, when I start driving my truck, the AC works great for a few minutes, but then the compressor turns off while the blower continues to work fine, but eventually it starts to blow ambient air after the compressor shuts off. I'm thinking it might be the AC switch, so I cleaned it. It appeared to work better and not turn off as much, but it's still unpredictable. When it goes off, I just keep hitting the AC switch till it turns on again. The interesting thing is that it appears to work OK during my morning drive to work, but I have trouble with it when more once the day starts heating up. I aslo replaced the low pressure switch on the evaporator, but that didn't change anything. Any suggestions what might be causing this to happen? I'm planning on cleaning the switch one more time with the electronic spray that evaporates quickly to see if it finally resolves this. Is there something else that might be causing this to happen? Your guidance it much appreciated.

Houston, TX

#3 Jun 22, 2007
I made a 4 hour trip today and decided not to mess with the AC switch when it turns off to see what happens. I monitored it for a while and realized that it startedt to cycle on and off every few minutes. It would run great for about 15 minutes and get down to around 38 degrees F and run for about 15 minutes, and then turn off and get up to about 75 degrees F for about 5 minutes before it turned off again. I'm wondering if it has some trash or possibly moisture in the system. Your thoughts?


Port Deposit, MD

#4 Jul 13, 2007
i have a 2000 silverado 1500 an my ac has freon and lines get cold but no a\c just all massive heat


#5 Jul 20, 2007
Sheldon, I have the same thing... my '99 Silverado A/C works for awhile, then blows warm air... shut it off for a few minutes, then ice cold. If it's only 70 degrees out it will run great. The freon is full...had it checked. Is it the low pressure switch being faulty or something else? Thanks, Bob

Richmond Hill, GA

#6 Aug 18, 2007
i have an 03 silverado that does the same as mentions above.i need a fix also.took it to the shop and they could not "reproduce the symptoms".Then on the ride home from there it stops.go figure.exact symptoms as sheldons!!!

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