Heater vents only work out the defroster
Thread Starter
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
Heater vents only work out the defroster
Ok so I was looking uP info on here an found that the heater vents work off vacuum I found the two vac lines that I broke how would I replace those an where do I hook them up to a 355 carb sbc I know one is full vac an the other is ac I think but I dont have ac ????
Re: Heater vents only work out the defroster
One is a vacuum source (intake) and the other is the heater bypass valve line. Cap/plug the bypass and hook the other one to any vacuum port on the intake.
Thread Starter
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: Heater vents only work out the defroster
yea i got it to work out the vents today wooohooo i hooked one line up to the full vaccum port on the carb an blocked the other one off
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