ac vacuum lines
Thread Starter
Junior Member
Joined: May 2009
Posts: 68
Likes: 0
From: Memphis,TN.
Car: 84 Z28 camaro
Engine: 383 stroker
Transmission: turbo 350
Axle/Gears: 3.73
ac vacuum lines
I want to put ac in my car but my problem is when I put it on vent or ac it doesn't blow out the vent. Where do I start to look for problems. Any help greatly appreciated.
Senior Member

Joined: May 2011
Posts: 855
Likes: 1
From: New Bedford MA
Car: 1988 Gta trans am
Engine: LR4 4.8
Transmission: 98-02 t56 6 speed
Axle/Gears: Bw 9 bolt (3.70’s) pbr rotors
Re: ac vacuum lines
There are two small vac lines that come out of the hvac harness u need to hook one up to part vac and the other to full vac if it doesnt still come out when u have them hooked up switch them and it should work
Senior Member

Joined: May 2011
Posts: 855
Likes: 1
From: New Bedford MA
Car: 1988 Gta trans am
Engine: LR4 4.8
Transmission: 98-02 t56 6 speed
Axle/Gears: Bw 9 bolt (3.70’s) pbr rotors
Re: ac vacuum lines
One is hooked up to the diverter valve on the heater core hose the other u can see it runs to the back of the hsr plenum hope this helps out
Thread Starter
Junior Member
Joined: May 2009
Posts: 68
Likes: 0
From: Memphis,TN.
Car: 84 Z28 camaro
Engine: 383 stroker
Transmission: turbo 350
Axle/Gears: 3.73
Re: ac vacuum lines
Yes, that helps alot, but I only see one hard line coming from the harness. I also discovered that I have a vacuum line not hooked up coming from the climate control switch, the violet color line is broke about 5 inches from the switch. I can't find where it comes from under the dash. Would this be my problem?
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