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    2005 Peterbilt 335 clutch fan runs all the time

    Last 6 of truck vin is 857391. I don’t believe it’s a low air pressure issue because this truck builds close to 120 psi just fine. Fan clutch works when I jump 12 volts to the fan clutch control solenoid. If it was a low air pressure issue I don’t believe it would disengage the clutch even when...
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    2005 Peterbilt 335 clutch fan runs all the time

    Appreciate all the input you guys. Does anyone have a schematic for this truck I could use? Having trouble finding one.
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    2005 Peterbilt 335 clutch fan runs all the time

    Could not find a fuse for “engine fan” or fan control. Dash has a switch that toggled between “auto” and “on” I pinned out the switch and it has 12 volt supply and sends 12 volts out depending on which way it’s toggled. Engine is the ISC315. Thanks
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    2005 Peterbilt 335 clutch fan runs all the time

    First post here We have a 2005 Peterbilt 335 water truck with a Cummins engine. The engine fan clutch runs all the time no matter what. When I put my meter on the two pin connector going to the air fan control solenoid I get 10.88 volts. Ground wire checks out good when checking continuity to...
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