Only in the summer when the AC is on ,and not often but my 2004 trailblazer will stall?? I have brought it to the dealers and they checked for codes and nothing ...It has always done this New ..Help p

Asked by May 25, 2013 at 09:32 PM about the 2004 Chevrolet TrailBlazer LS

Question type: Maintenance & Repair

I live in NC so the summer is hot and muggy...when my ac is on and the radio the car will stall at a stop light ...we have tried to fix it and nobody ever finds anything wrong

2 Answers

107,495

Could be the idle air control valve either bad or dirty. It's job is to idle your vehicle up when ac and or other acc are being used. Try cleaning it first also clean throttle plate and throat of throttle body around the plate. Hope this helps.

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When you switch on the A/C this sends an "a/c request" signal to the computer. The computer then increases the idle speed about 50 RPMs to compensate for the added load of the A/C compressor. This sequence of events will also happen when "defrost" is selected. Most likely, as the above poster said, the IAC (idle air control valve) is not responding. If cleaning it doesn't solve the problem replace it. They usually aren't too expensive. HTH. - Jim

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