alaninin

iTrader: (1)

Here is whats happening. No matter where the selector ac/heat switch is the air only comes out the center vent that is up on the dash. Im not sure where to start trouble shooting. All fuse seem to be good. The fan works on all 3 speeds but nothing changes if you put it on max AC. I'm thinking it maybe a derectional air flow that is not switching but how do you check and how to get to it??
Any other ideas? Anything will help. I'm sort of stuck so please someone HELP.

Thank you:confused

fleetmgr

All the doors that direct airflow inside the heater box are vacuum controlled. You probably have a line that's become broken/disconnected. Start by checking where it comes off the back of the intake manifold.

alaninin

iTrader: (1)

Thank you I will start checking vaccum lines first and reply if I find anything.

alaninin

iTrader: (1)

Did not find any vaccum leaks.

LS6427

iTrader: (2)

check this too.

https://ls1tech.com/forums/general-m...cuum-line.html

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alaninin

iTrader: (1)

I checked this and there was no leak there but I disconnected it and there was no vaccum. Any idea where to go next. Thank you for your help.

LS6427

iTrader: (2)

Check behind the intake to see if the vacuum hose fell off that feeds that set of lines their vacuum.

Its gonna be hard to reach back there to feel for it if you don't know where it is. Try to get a picture of the rear of an intake so you can see what your reaching for.

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alaninin

iTrader: (1)

Still did not find anything. Is there a vaccum line diagram?

alaninin

iTrader: (1)

Is there any more places I should look?

alaninin

iTrader: (1)

It was the vacuum lines behind the intake. Finally found the line that was just disconnected. Thank you