ok this is the weirdest thing ive ever seen " my 92 bird when i turn on the ac and i move the *** back and forth no mater what the position i dont feel it come out of the vents in the dash all it comes out is the defroster vent on top. i got no idea whats going on i cant seem to get it to come out of the vents in the dash or at my feet or honetly if im even doing it right? help please

 

CB a vacuum problem, there's a vacuum solenoid thing behind there that tends to leak air.

Do you hear hissing sound inside the car? near the HVAC controller. Theres a vid on YT on how to rebuild them - simple.

Also CB actuator on damper that diverts the air flow inside the ducts ... my Camaro has flow issues like that.

Also my fan runs fast on fan setting 2 than on 4 - weird.

 

yea mine same here.and no no leaking noise and how do i fix the actuator

 

Dunno for sure, haven't done it yet, its on the list.

Guess: got to take dash apart and get to it - not sure where it is exactly.

Chilton book may have info on it.

 

i seem to have gotten it but its not the most important i just dont need it fogging the windshield

 

Defrost is the default setting when there's a vac leak. The following link details the most common issue:

https://www.thirdgen.org/forums/inte...anent-fix.html

JamesC

 

thanks

 

Before you go tearing into the dash, you should note that there are 2 BLACK vac lines in the HVAC harness. If someone messed with them in the past and didn't put them back together properly, nothing is going to work the way it's supposed to (one is the vac source and the other is the output to the heater control valve). Find the harness by the heater hoses that come through the firewall and find the lines. Swap them around, where they're currently connected, if possible. Try to see if the controls work again.

If that fails, reconnect the lines where they were originally and then proceed to mess with the vacuum switch on the control head.

 

Check the voltage coming to the motor from the high speed relay with the HVAC turned on and the system set to HI... Should be battery voltage. Chances are you have a power problem between the battery and the motor (I believe the relay power comes from the junction block by the headlights).

 

so i got it working it works fine and blows through the vents while the mother is running but once it cuts off it slowly decipates and goes back to defrost i think its saposed to do that

 

Yep once your engine is off, vacuum goes down and the damper is forced open.

The damper is a triangle shape in the duct right behind the stereo - I know cause a piece of my duct was cut off by PO, if I swing it by hand I can feel more air out of the front vents.

 

cool then its operating corectly now

 

How'd ya fix it anyway ?