Heat or Air wont blow out of vent

[diedwards]

My heat or air wont blow out the vents but it blow everywhere esle. and I changed the heater knob. I just bought a new unit thinking that is the problem but it wasnt. Any suggestions to why it wont out the vents. How do i fix it and has anyone else had that problem.

[c0ncEpT]

I know its sounds kinda random but have you installed an intake manifold recentily?

[1BADAIR]

sounds like a vacuum issue.
check the vacuum lines on the intake and on the reservior under the front fascia

[diedwards]

I know its sounds kinda random but have you installed an intake manifold recentily?

no i have not. I did put a head gasket on a few months back and i think that is when my problem started. I cant say for sure

[MattODoom]

Is the heaterbox vacuum operated or electrical? Mines vacuum but the '46 is electrical. If its vacuum you could have a leak and its just not moving the diverters in the box.

[1BADAIR]

temp is cable. vents are vacuum I am pretty sure
make sure the vacuum line is hooked up and the check vavle is present. If the valve is bad the air will switch locations under WOT.

[diedwards]

its vac and i will for a leak in the morning

[c0ncEpT]

Threre is a little hose that goes into the back of the intake and if you dont plug it in it will make none of your shit work! and if that is your problem its a ***** to get back on!

[DETROITMUSCLE]

Hes got an LT1 though is it the same setup?

[c0ncEpT]

Hes got an LT1 though is it the same setup?

hmmmmmm idk