Blend Doors

I have a 95GP SE 3100 series
Having some trouble finding the cause for my blend doors not working for my A/C.

Any Ideas of what fuses, or panals I can check to see if any of those are the problems?

If the air is split 50/50 between the heat and defrost, I would say your vacuum supply for the actuators is disconnected, or the plastic tube that goes from the engine to the interior is cracked somewhere, not allowing the vacuum to reach the actuators that control the modes. IF you have a vacuum pump, you can check to see if this is the case. The mode valve is on the drivers side of the heater box, pull the vacuum line off, hook up your vacuum pump and apply vacuum. If the air moves to a specific position, then your vacuum supply is bad, if it still comes out 50/50 defrost and heater, the mode valve is bad

I'm sure you got this fixed by now, but for everyone else with the same problem, here is what I found. I have a 1991 that was doing the same thing. If you cruise control quite working too then the problem is the vacuum line coming off of the cruise control unit. If the hose coming out of the "t" does not have a plug on the end of it you will have to twist a screw into it to make the fix.


I have a 95GP SE 3100 series
Having some trouble finding the cause for my blend doors not working for my A/C.

Any Ideas of what fuses, or panals I can check to see if any of those are the problems?