This is topic ac's problems in forum Tech Talk at Northern California Ford Owners .
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Posted by kris (Member # 9057) on
:
On my 87, I'm having problems with my AC. It runs fine while driving, but when I stop the rpm's drop. Sometime the car stalls. As soon as I turn it on vent it stops and the rpm's go up.
Any ideas??
[ April 21, 2009, 02:26 AM: Message edited by: kris ]
Posted by 166 Merlot (Member # 1549) on
:
Running the ac draws a lot of current. You might want to check your grounds and also take a voltage reading with your car idling and the a/c on. It should be over 14 volts. then post up with what you found
Posted by 94AFRCobra (Member # 9097) on
:
Sounds like the idle up circuit for the A/C isn't working. The idle up circuit raises the idle to compensate for the additional load of the A/C compressor. This circuit is controlled by the ECM. When the ECM gets the input that the A/C is on it sends a signal to the IAC to raise the idle., You could have a bad IAC, the passages could be partially plugged or the ECM may not be getting the signal that the A/C is on.
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