2012 peterbilt 388

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by angeldue, Feb 12, 2021.

  1. angeldue

    angeldue Bobtail Member

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    Feb 12, 2021
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    doing mechanic work on a 2012 peterbilt 388 defrost vent isn’t blowing air, changed actuators defrost vent is open, but no air yet would the problem be the heater box?
     
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  3. pushbroom

    pushbroom Road Train Member

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    Go in through the 2 main dash panels and follow the y ducting for defrost down to a big chamber. There is a drum inside that rotates to direct air. Actuator is on the left of it. Pull the actuator and grip the drum stub with you fingers and see if it moves. If it moves you need an actuator, if it doesnt there is some spitz or a pen caught in the drum. You can try blowing air down the defrost as you wiggle the drum to dislodge it.
     
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  4. angeldue

    angeldue Bobtail Member

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    Feb 12, 2021
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    I took out the y ducting and opened up the drum you are talking about, air flow is weak coming out the defrost vent and the knob to change to floor or defrost makes a clicking sound even though i changed out the actuator to rotate the drum
     
  5. Goodysnap

    Goodysnap Road Train Member

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    Pull the actuator off and rotate the drum by hand back and forth. Whatever is lodged needs to come out the top by hand or may fall out the bottom and gone to neverland.

    Once the debris is gone, put actuator back on and check op for full travel.
     
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