89 379 heater

Discussion in 'Peterbilt Forum' started by Rabbittrucker1313, Feb 14, 2024.

  1. Rabbittrucker1313

    Rabbittrucker1313 Bobtail Member

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    Feb 14, 2024
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    I cannot get my blower motor to work in my 89 379. I’ve replaced the blower motor and the reastat. And the blower motor still will not kick on. Has anyone had this problem before?
     
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  3. Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    Have you checked the fuse ?
     
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  4. Coolbreezin

    Coolbreezin Medium Load Member

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    Attach + and - wires to the fan. If it works then check the fuse (see above) and the original wires.
     
  5. RocketScott

    RocketScott Medium Load Member

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  6. Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    I forgot to mentioned the switch. On my former 94 379, I had to place the switch because it wouldn’t work on high. When I removed the old switch, it seems it has gotten hot, had to snip the end of the wires and put new connecting ends. Have you replace the switch yet ?
     
  7. Last Call

    Last Call Road Train Member

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    One of the reasons switch’s and resistors give problems is because the 379 is notorious for getting moisture in the fuse box causing resistance and it likes to melt the connections at the switch and resistor
    Especially if the windshield has ever leak which a fair amount of them do
     
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