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Engine will stop running when stopped with air conditioning on.

Tiny
COKERAL59
  • MEMBER
  • 2004 SATURN VUE
  • 2.2L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 200,000 MILES
The engine will run fine while moving with the air conditioning on. It will shut off as soon as you come to a stop. I turn off the a/c, restart the engine, and drive away, then turn a/c back on. It runs fine until I stop, then it will shut off again.
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Friday, June 6th, 2014 AT 7:27 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
Either you have a vacuum leak or the idle air control valve (IAC) is bad.
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Friday, June 6th, 2014 AT 9:22 AM
Tiny
COKERAL59
  • MEMBER
  • 3 POSTS
I was thinking maybe a voltage regulation problem. I will check it all out. Thanks very much.
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Friday, June 6th, 2014 AT 12:09 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
Why do you say voltage regulator? Is the battery light coming on?

My belief is the idle air control valve (IAC) is the issue, but like I said, a vacuum leak can cause the issue too. The IAC is responsible for maintaining the engine idle speed. With the AC on, there is an added load on the engine. As a result, the computer should adjust the IAC to compensate for the extra load. If the IAC isn't working properly, the engine may stall at an idle.
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Friday, June 6th, 2014 AT 7:57 PM
Tiny
COKERAL59
  • MEMBER
  • 3 POSTS
Thanks again, I guess I was fishing for a cause with the voltage regulator idea.
I'm going to check the IAC and the vacuum lines today.
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Saturday, June 7th, 2014 AT 5:01 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
Let me know what you find.
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Saturday, June 7th, 2014 AT 7:44 PM

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