1999 GMC Jimmy LT V6 4.3L Vortec with 70,000 Miles 2 door 2WD. A/C works fine for about 10 minutes or so, then starts blowing ambient temperature air. If I turn it off and let it set for awhile (ie. 1 hour) and start up it, it will blow cold air again for about 10 minutes then starts blowing ambient temp air again. This happens every time I drive it. I have to add 1-2 cans of coolant every summer, but this problem only started a couple months ago. Is there some type of thermostat somewhere that is going bad? Thanks.
Thursday, August 30th, 2012 AT 8:10 PM