O/T 1999 F250 Power Stroke

Anonymous-0

Well-known Member
My F250 started blowing air out of the defroster only and hard to get in 4 wheel drive. Found both vacuum lines to the top of the brake calipers damged and replaced, it worked for about 1 month. Now the problem is back. If I by pass the 4 wheel drive vacuum selector, the temp selector works in all selected positions. When I hook up a vacuum guage to the 4 wheel drive switch, I get nothing and if I hook a vacuum pump to the brake caliper, I can't pull a vacuum. What do you think, a bad 4 wheel drive switch and seals in the hubs?
 

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