389 blower issue, front fan for climate control works on high only.

Front fan for climate control works on high setting only (number 4) if I back it off to 3, 2, or 1 the fan does not work at all. I was told the 379's had a resistor for fan settings does the 389 have the same ?

Second problem with the climate control is I either have full heat or no heat. If I rotate the thermostat dial back towards cool I lose all heat. Bunk seams to work just fine no issues there yet.


any thoughts ?

 

Thank you for the reply.

 

It was on the back side of the blower motor if anybody else has a problem with it.
1/4 socket is what I used.

The old resistor looked a little worn !

Blower works fine on all settings now, thanks again for the help.

 

I'm wondering if the temp actuator is causing my temp issues ?
Hate to just throw parts at it and hope for the best especially at Peterbilt prices.

 

Thanks again !!