I'm in the process of fixing up my newly acquired Blazer and while it's running, there's a small vaccuum leak in the HVAC controls. I've narrowed it down to the actual unit itself leaking (in the o-ring bushing). So my question is, how hard is it to take out the entire unit and replace it? I've taken the entire underside of the dash apart and had the unit hanging out, showing the vaccuum lines. Can it just be unplugged, or is there more to it than that? I don't want to rebuild the thing so I'm just looking for another one, someone may have. If you know of anything, please post, PM or email me. Thanks everyone!

 

Sorry this was missed. Yes, it can just be disconnected and replaced.

 

Hey Dude,

I have just had the very same problem, You can get those units on Ebay foraround 50 bucks. 179.99 at parts store. Mine should be delivered today UPS.

Goodluck!