I have a 99 Durango and the air control switch, switches from floor to defrost but does not switch to the front vents when the ac is on it comes from the floor what's wrong I took the dash apart i can't see anything wrong

 

could be vacuum leak not giving it enough vacuum to get it all the way switched.

 

I pulled the control switch plug and there is suction I'm not real sure how much there is supposed to be though

 

If you have a vacuum leak it will do that because there isn't enough vacuum to hold it to the panel. Check the main vacuum lines. Without a vacuum meter you really don't know what you have. Usually it is a vacuum leak issue or a check valve issue. There are 2 check valves, one in the dash somewhere and one on the brake booster.

 

Thanx man your awesome

 

Ok I pulled back the passenger main dash back I can see a door which I am guessing it's the door that let's in the cab air for max ac that door is working I saw it move where is the door that makes it change directions

 

Anyone have a 98-00 vac diagram for all the locations to look?

IndyD

 

Here is the switch:



VACUUM CHECK VALVE
Two vacuum check valves are installed in the
accessory vacuum supply line in the engine compartment.
One check valve is located near the vacuum
fitting on the power brake booster. The second check
valve is located at the heater and air conditioner
take-out of the accessory vacuum supply line. The
vacuum check valves are designed to allow vacuum
to flow in only one direction through the accessory
vacuum supply circuits.
The use of the vacuum check valves help to maintain
the system vacuum needed to retain the selected
heater-A/C mode settings. The check valves will prevent
the engine from bleeding down system vacuum
through the intake manifold during extended heavy
engine load (low engine vacuum) operation.
The vacuum check valves cannot be repaired and,
if faulty or damaged, they must be individually
replaced.

 

Well I can't get the damn pictures to look better, but the second picture it is the part on the brake booster that the vacuum hose plugs into.

Now the one on/by the panel switch in the dash I am unsure of.

 

Excellent HS.

"The vacuum check valves cannot be repaired and,
if faulty or damaged, they must be individually
replaced."

Part number(s) on the little guys?

IndyD