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

Asked by 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

25

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

115,095

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

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