why does the a/c on my car stop when accerolating

Asked by Aug 19, 2015 at 03:42 PM about the 2004 GMC Safari

Question type: Maintenance & Repair

2 Answers

19,755

sounds like your loosing vacuum...if your not talking abouut the ac clutch...

1 out of 1 people think this is helpful.
59,115

If, when accelerating the airflow shifts from the dash vents to the defrost (windshield) vents you have a bad vacuum check valve. The check valve is in the vacuum line coming from the engine thru the firewall. You'll see it on the engine side of the firewall. Looks like this: HTH. -Jim

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