Fan blower only works on high speed....
I have the Itasca detailed below, and lately has developed an issue where the dash fan will only work on the high (noisy!) switch setting. After starting the engine (Chevy workhorse 8.1 engine chassis...
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There is a resistor block that contains two resistors immersed in the air flow that are in circuit for medium and low fan selection. This resistor failure is very common and can typically be changed out by removing same in the passenger side foot well.
