Help! Vacuum line to HVAC controller in '86

[86-ZZ3]

I'm trying to debug the multiple problems in my '86 with the C68(?) electronic HVAC control. Looking at the vacuum outlets from the top of the runner, I only see one vacuum hose to the fuel reg and the other to the check valve which goes to the cruise control and the fuel recovery canister(?) I cannot find the vacuum hose that goes to the HVAC controller. Can someone point me to where this comes through the firewall? (no FSM so thanks in advance).

 

[vetteoz]

At the check valve ,the rear line should run to the HVAC; the side line goes to the fuel evap canister teeing off to the cruise control on the way .

The HVAC line is part of the wiring harness on the firewall behind dist ; black plastic tube only sticks out about 2" from wiring.

 

[86-ZZ3]

Thanks. Is the harness that biggest one has a bunch of wires coming out of the firewall just behind the right side valve cover? I see a thick vacuum hose but no outlet. Must have popped back into the harness somewhere along the way.

I'll remove the distributor/cap today and see if I can get it out.