Question about 2002 Ford F250 Super Duty SuperCab

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When i turn on heat or ac it runs on the defrost setting but wont shift to the vent or floor until the 4 wheel drive knob gets turned on 1999 f250 I heard this was a common problem is it the switch for 4x4 or ?

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You have a vacum leak in the 4x4 engagement system. there is a vacum solenoid on the passenger side next to the battery. should have 3 hoses to it I believe. check those hoses for cracks they go all the way to both front wheels. the ones in the wheel wells are usually messed up. if all hoses are good hook up a hand held vacum pump to each wheel they should hold about 15 hg on the vacum guage if not your wheel hub seals are leaking.

Posted on Jun 24, 2009

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