2002 Ford F-150 A/C

RCBS123

MEMBER
2002 FORD F-150

Air Conditioning problem
2002 Ford F150 V8 Four Wheel Drive Automatic

My 2002 Ford F150 has a problem with the a/c. When I am cruising down the highway the a/c works fine, but when I accelerate the fan cuts out. When I resume to the cruising speed the blower comes back on.

3 Replies

JACOBANDNICKOLAS

MECHANIC
108,254 POSTS

Have you checked for loose or bad connections to the blower motor? Also, do all the speed settings work?

Let me know.
Joe

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Saturday, May 29th, 2010 AT 9:33 PM

RCBS123

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1 POST

All connections are good and all the speeds work fine.
When the pickup is just sitting and idling everything works fine. When I hit the accelerator the fan cuts off and sometimes will go into the defrost mode by itself.

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Sunday, June 6th, 2010 AT 5:52 AM

JACOBANDNICKOLAS

MECHANIC
108,254 POSTS

Okay, I missunderstood. I thought the fan shut off. If that is the case, you are looking for a vacuum leak. The vent doors are actuated by vacuum. WHen you accellerate, intake vacuum drops. If you have a leak, the default for air flow is the defroster.

Check both under the dash and the hood for leaks. With the engine running, you may get lucky and hear a hissing sound from the leak.

Let me know what you find.

Joe

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Sunday, June 6th, 2010 AT 11:29 PM