AC/Heater
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New User
Joined: Sep 2003
Posts: 5
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From: Valdosta,GA
AC/Heater
Have any of you heard of this. My 91 stock bronco has a strange prob with the ac/heater. when Iturn in on to blow out of the vents it is fine, when I start driving and get over about 40 mph it starts blowing out of the defroster, when I slow down it start blowing out of the vents agian. Any help would be great.
Elder User
Joined: Oct 2002
Posts: 573
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From: Medina, Tn.
Sounds like a vacuum problem to me. Mine did the same thing when I had it on MAX. Check the creme color hose on the passenger side near the firewall coming off the small motor. Mine was bad at this place only and took care of my problems. I just got a small piece of hose and cut the old out and then put the new in with heat shrink tape and then put a vacuum gauge on it and it didn't drop at all. You could also attach it with a larger size hose with the smaller fitting inside.
Good luck.
Good luck.
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