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heater switch only works on high

2005 t2000 kenworth

Heater stop blowing on lower speeds will only work on high Changed out switch same problem can jump wires to get other speeds Have tried to chase wires with no luck Any ideas without getting entirely into dash AC still works but only on high

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There is a resistor that controls the fan speeds. Change that out and your back in business.

I have a 2001 Freightliner FLD120 and it's behind the kick panel on the passenger side by the blower motor.

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i'm betting jackie is right on the resistor,take a 12 volt test light to ground and probe each wire at the connector to the resistor,change the switch setting each time you test,that will test the switch side.

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Thanks for the come back It was my resistor on the t2000 You can find the blower motor between the wiper blades on the fire wall pull off the top easy to get to I replaced mine with Climatech CA 1070

Dean

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Great, glad you got it fixed.

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My 2001 T2000 Did the same. Under the hood on top of the hvac unit there is a small cover held in by one screw. In it there is a resistor that controls the fan speed. Replace it and should work

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In my case all the resistors were fine but in that unit is also a diode,which was my problem. I mechanically fastened it rather than solder as this unit gets rather hot and I feared it would just melt the solder. I just drilled a 1/32" hole in each of the tabs inside and ran the leads thru with a nice tight pigtail joint and it solved my problem. All 4 speeds work again.

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Dean Lambertson will be eternally grateful.
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