Heater Control

[mdibbin]

I have a 2003 Chevy SS; I bought this truck with the 5 setting on the heater control not working...sooner than later all the settings (1-5) not working. I bought a new resistor from the dealership and installed it. As soon as i installed the new resistor the 5 setting still did not work. Now none of them work. I"m wondering if i need to buy a new heater control unit. (the one in my truck has the vertical heat controls not the digital readout)....Please Help it's been below zero lately brrrr.

[ewood01]

Its been my experience that the heater switch is burnt up on the high setting and this can be caused by a blower motor going bad causing high resistance. So you problaby need a new motor & switch.

[Sierra67]

I think you are right about the switch, I am having a similar problem with my heater controls on my 99 Yukon. I have replace the resistor but no change. Now I have to replace the switch but unable to find it. I am trying to avoid going to the dealer as they have overcharged me on several occasions.

[ryank1]

Check the wires that plug into the resistor as well to make sure that they have not overheated and melted.

[chaz7311]

had similiar problem in blazer, replace blower fan, and resistor, all problems solved!