Cab blower motor only works with AC on

Discussion in 'Peterbilt Forum' started by kwforage, Mar 8, 2024.

  1. kwforage

    kwforage Road Train Member

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    Jun 3, 2007
    Wisconsin
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    2000 379. The cab blower motor will only work on #1 speed if the AC or defrost is on. 2,3 and 4 work fine. I'm stumped.
     
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  3. The one california kid

    The one california kid Medium Load Member

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    Oct 31, 2023
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    2,3 and 4 work fine, ok you lost me here. Do you mean with the heat on 2,3 and 4 work fine? And then with ac on it only has one speed?
     
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