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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

engine dies when AC is on

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Old Sep 29, 2017 | 06:43 PM
  #1  
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terry274
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engine dies when AC is on

My truck is a 1996 F150 with a 302 and automatic transmission, 133,000 miles. Plugs, wires, distributer cap and rotor are all new Motorcraft items. Ignition timing is set at 12 degrees advanced. (The problem was there before the timing was advanced) The fuel filter has been changed.

The truck runs very well with one exception. If I start it with the AC on, it will normally die or run very rough. With the AC off it is fine. The problem seems worse when it is at operating temperature.

Why is it doing this?
 
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Old Sep 29, 2017 | 07:17 PM
  #2  
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Check to see if there are any fault codes in the system. It sounds like the IAC isn't working. It should increase the rpms to compensate for the compressor load.
 
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Old Sep 29, 2017 | 07:50 PM
  #3  
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From: Nixa
My 92 did this, it turned out the compressor had seized up.
I didn't know it had seized up til the belt got all torn up. When I was replacing the belt is when I found the compressor was bad.
 
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