Auto Climate Control: Air Mix Door(s) #2 Not Moving

  • vgterian94
    vgterian94
    Senior Member
    • 645
    #1

    Auto Climate Control: Air Mix Door(s) #2 Not Moving

    I only get cool air through my floor vents and I found out from output system diagnostic cycles that the air mix doors beneath the heater core were not opening to let heat through.

    I know that the power servo controlling these doors is holding vacuum.

    I will be following the diagnostic procedures for the doors, auto amplifier, and solenoids but I was wondering if someone already has experience with this issue and if a broken potentio-balance resistor could cause this. Also, I have trouble understanding the leftward arrows and "(Ad)", "(Av)", and "(Af)" drawn in table K1 of the FSM (1984) on page HA-73- Trouble Diagnosis: 2) Doors, Water Cock, and Compressor Diagnosis.
  • flatfoot
    flatfoot
    Senior Member
    • 253
    #2
    you sure you have vacuum going to the servos?

    I'm sure you realize the default default position for the floor doors is shut when you don't have vacuum to them.
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  • utjon
    utjon
    Senior Member
    • 260
    #3
    I know this is old.. but in lieu of a new thread. Im having the issue of air coming out of my floor vents and through the defroster. Nothing comes through my regular vents. If I hit the manual defrost I can see a vent open inside and close when I turn it off.
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