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Old 12-26-2011, 05:32   #1 (permalink)
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99 GM surges only when heat or a/c is on, ideas?

Had the car about 6 months, 140K. miles. Just as the title says, I turn on the heat and it surges when coming to a stop or sitting at a light etc. It runs fine at cruising speeds. Can someone point me in the right direction? I don't like throwing darts blindfolded. Thanks in advance, Mike.
(I tried searching but no luck.)
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Old 12-26-2011, 17:37   #2 (permalink)
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Re: 99 GM surges only when heat or a/c is on, ideas?

Is that when it's set for only the floor?
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Old 12-27-2011, 01:56   #3 (permalink)
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Re: 99 GM surges only when heat or a/c is on, ideas?

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Is that when it's set for only the floor?
I haven't tried other positions, I will and report back with the results.
It's a great ride except for this little annoyance. My wife is almost afraid of it because of this.
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Old 01-04-2012, 06:39   #4 (permalink)
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Re: 99 GM surges only when heat or a/c is on, ideas?

Hello:
Check for vacuum leaks and clean, or replace, the IAC valve.
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Old 01-05-2012, 03:15   #5 (permalink)
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Re: 99 GM surges only when heat or a/c is on, ideas?

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Originally Posted by Bajarider View Post
Hello:
Check for vacuum leaks and clean, or replace, the IAC valve.
Thanks, but since i posted the question, it hasn't done it not one time. She must have found out I was talking about her on the 'net.
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Old 01-05-2012, 09:22   #6 (permalink)
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Re: 99 GM surges only when heat or a/c is on, ideas?

The people on hear have physic powers over cars . Glad it's working o.k , but if it re occurs you have a few possible solutions you can check out .
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