2012 Kenworth T-800 heater

Discussion in 'Kenworth Forum' started by Wheel holding, Jan 7, 2022.

  1. Wheel holding

    Wheel holding Bobtail Member

    1
    0
    Jan 7, 2022
    0
    I am having issues with my heater / defrost. The actuator seems to be moving, the blower motor is running, its putting out heat, but barely blowing through the vents like there is a blockage but I can't find anything. Is there a sensor or restrictor or something else that I am missing or would the controls be causing it ?
     
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  3. kwcam

    kwcam Light Load Member

    171
    127
    Dec 29, 2012
    at the shop
    0
    Most likely the surface between the a/c evaporator and heater core are plugged up. can be cleaned by removing the blower housing and tray holding freeze switch and separating the cores enough to blow them out, I use a blow gun with a length of plastic air line attached so it can fit down between.
    The reason they plug is the moisture from the a/c allows dust/dander etc to stick on the heater core surface.
     
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