Engine revving up and down when AC is turned on

Tiny
CJCOOK21
  • MEMBER
  • 1999 FORD F-350
  • V10
  • 4WD
  • AUTOMATIC
  • 183,000 MILES
The truck idles fine when ac is off but when the ac is turned on the engine revs up and down a few thousand rpms like im revving the engine. Then I turn the ac off and everything goes back to normal. What could the problem be?
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Monday, July 28th, 2014 AT 10:29 PM

1 Reply

Tiny
HMAC300
  • EXPERT
Check for a vacuum leak like a broken hose etc.
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Tuesday, July 29th, 2014 AT 6:44 AM

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