hard vacuum line ID - '87 GN

[Blazer406]

I have a hard line coming across the back of the firewall... behind the A/C box shield... and goes around the blower motor and down into the black where I cannot see it. I think this is the HVAC vacuum line.

There is a second one going there also... but where it goes behind the shield.... it doesn't come out (toward the middle of the firewall....out from under the heat shield) that I can see.....

Is that confusing enough?

It is like I have one line going in (from the middle going toward the pss side.... ) and two separate lines coming out and traveling around the blower motor going into the car...

It isn't the map sensor... I already have it hooked up...it isn't the heater valve...as it is hooked up....

Any ideas?

 

[KevinB]

One connects to the vac line by the EGR solenoid. That's for the hvac controls. The other connects to the heater control valve going to the heater core.

 

[Blazer406]

One connects to the vac line by the EGR solenoid. That's for the hvac controls. The other connects to the heater control valve going to the heater core.

Ahh..... I got mine hooked up wrong..... duh.... the heater control has to hook into the heater valve to send the hot water thru the core..... duh..... I'm such a putz.

Thanks.