engine dies when ac/heater turns on
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Junior Member
Joined: Nov 2003
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engine dies when ac/heater turns on
When I turn on the AC or Heater/Defroster, sometimes the RPMs go to zero and the engine dies. I am guessing that I have a bad alternator or the belt tensioner needs to be replaced. The battery is about one year old. Any ideas?
The automobile is a 1988 Ford F150.
The automobile is a 1988 Ford F150.
Technical Article Contributor
Joined: Dec 1997
Posts: 9,417
Likes: 11
From: Windsor,Ontario,Canada
If your compressor is on the way out it will seize and stall the engine. If your IAC is dirty the load on the engine can stall it because the IAC can not open up fast enough to compensate for the added load of the A/C compressor.
Regards
Jean Marc Chartier
Regards
Jean Marc Chartier
Senior Member
Joined: Oct 2002
Posts: 7,295
Likes: 125
From: St. Louis (Out in the woods)
Adding to JMC's comments, if you can give it a little throttle and it keeps running when engaging the A/C compressor, the compressor is probably fine.
Replace the IAC, then disconnect the battery so that the computer is forced to relearn idle speeds and engine loads when everything is brought back online.
Steve
Replace the IAC, then disconnect the battery so that the computer is forced to relearn idle speeds and engine loads when everything is brought back online.
Steve
