does anybody have a diagram of the vacuum lines that control the heater and A/C controls for an 87 'bird? I need the actual routing of the lines as installed so I can track them down and get everything working properly once I get the engine running

previous owner pulled/cut/blocked them off.....not sure as to the hot/cold lever, but the AC/vent/etc lever is stuck on defrosters

 

I've asked for this before, but nobody seems to have one.

 

The Chilton book I got from the library for third gen Camaro and Firebird has some diagrams. If I had a scanner I'd post 'em up.

 

I'll have to get my scanner out and make a trip to the library, then........

 

A diagram is not necessary. The system is too simple. It's about like looking for a diagram for a garden hose. Most of the time, if it doesn't work right, it's not hard to spot the problem.

Vacuum comes in from the engine, in a purple vacuum line at the control head; and then gets sent around by the selector switch to move the various little air doors.

Most likely, if your system is staying in Defrost, you have no engine vacuum supply, and you need to just fix that and not mess around with the control head at all. Look for a little plastic vacuum line coming through the firewall in the A/C wiring harness, just below the heater hoses. That line should hook up to the vacuum accumulator, which stores enough vacuum to hold the doors in place for a little while when you floor the gas. It gets its vacuum from the manifold.

 

I know that, on mine, the vacumn cannister is missing one of the hoses. The one from the firewall, presumably to the controls, is there, but the other one is missing. Where should it connect to on the car? Engine? Carb? Where? I can get some line from Autozone if I knew where to run it!

 

It should connect to a source of constant vacuum. IIRC, it's supposed to go to one of the small fittings on the base of the carb, on the rear.