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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with your fan switch in the lower settings do you have 12V to the resistor if you do then replace the resistor if you don't then it is the fan switch or wiring.
