why does my rpm drop when my car is idling at a stop and the heater or a/c is on?

Asked by markterri2013 Sep 13, 2013 at 03:00 PM about the Chevrolet Cobalt

Question type: General

when I'm stopped at a red light or stop sign and my heater or a/c is on my cobalt acts like
it wants to stall out. My engine temperature fluctuates between 189 to 196 degrees.

2 Answers

35

a couple things.. so if your heater/AC is NOT on it idles fine at stop? Is heat on defrost? Could it be the AC compressor kicking on? Maybe check fuel pressure. Possible tune up

1 people found this helpful.
171,545

Dirty or faulty idle air control valve. Clean or replace it as needed.

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