How to test heater controls?

Discussion in 'Interior' started by xjsc16x, May 10, 2018.

  1. xjsc16x

    xjsc16x Member

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    Name:
    Justin
    2002 Tahoe with dual zone manual controls (front on the dash and rear on the overhead). Truck was off the road for a few months, just now getting back into driving it and the heat is always blowing hot air.

    Things I've done:
    - confirm Air conditioning system is functional (compressor turns on, good pressure, lines going to and from the evaporator are ice cold)
    - replaced blend door actuator with a new one off Rockauto
    - took the actuator off and moved the rod myself and I can correctly change between cold and hot air
    - relearn procedure at least 5 times now didn't do a thing

    With the actuator off but still plugged in, I can see the the motor does move it a tiny bit but only maybe .5-1 degree. It's barely noticeable the amount it moves.

    Is there any way I can chech the temperature contols or the signal coming to the actuator with a multimeter? What else can I do to diagnose this?

    Thanks,
    -Justin
     
  2. xjsc16x

    xjsc16x Member

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    Bump, not sure if this is normal or not but I can turn the rod by hand when the fans are off but when they're on I have to use a pair of pliers to turn it. I assume it's because of the air blowing gives it resistance?
     
  3. josh336

    josh336 TYF Newbie

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    I came across this video the other day. It's worth a shot.


    Sent from my iPhone using Tapatalk
     

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