As soon as I finished installing the afr 165s on my car the AC from the main vents no longer works. When I was finishing up putting the car back together I remember knocking a nipple off the passenger side in the engine bay and couldn't figure out where it went. I am guessing that has something to do with it. I know it is common for the hard line coming from near the heater core lines to a post on the driver side to be broken, but I checked that and it is not. Any suggestions would be great, thanks.

 

there is a small black plastic hard line the goes from the vacuum tree to the firewall if it is disconnected it will only blow out of the defrost vents

 

that is the same line I am talking about, but I went over it again and found the problem. Where it goes into the vacuum tree it was snapped near the end. So I put a new end on it and I ducktaped a hole it had in another spot lol. After repairing it, the vents work again.

 

good deal

 

i have same problem, only my vacum line to the tree is connected and good

 

Look along the line for holes, a decent sized hole would make it so they don't work as well.

 

Where is the vacuum tree located? I only have air blowing out my defrost too. Its a 89 GT.

 

Drivers side over by the brake booster.

 

im thinking its leaking behind the dash somewhere cause i did a heater core like a a year and half back