Hi Everyone,

here is the story. About 2 months ago we noticed a vacuum leak behind the HVAC control that directs the flow of air (floor/defrost/vent etc). I went to the dealer and purchased another control and all was good. There was no longer a vacuum leak and everything was working fine.

Now the problem appears to have returned?? Fortunately the dealer gave me another part under warranty, but I can't help but thinking there is something else causing the problem. I'm reluctant to reinstall the new part until I find out if there is something else I need to be looking at.

Any ideas?

Forgot to mention my Blazer is an 02 with the three button four wheel drive control