1989 gmc defroster
45

Asked by stew89gm Nov 17, 2010 at 06:11 PM about the 1989 GMC Sierra

Question type: Maintenance & Repair

I cant get my fan to blow any air out of the defrost location. it works fine on the vent and feet locations. What should i do to fix this???

4 Answers
2,455

Steve answered 13 years ago

you have a vacum leak, look for a round ball with vacum lines going to it. If it is mounted on the hood make shure the vacum hose is hooked to it'the round ball(vacum Canister) might be lokated in one of the fender wells. Also the vacum line likes to fall off of the engine right where it hooks to the engine definet vacum problem.

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