Originally Posted by Bella123
Thanks for the Onan info... Still chasing the cab a/C fan issue, really learning the dash & under hood!
I misunderstood your question - I thought you were talking about the rooftop air conditioner, not the dash a/c.
This is generic advice; I have no experience with your chassis: I'd do a little troubleshooting with a voltmeter to see if it's the switch, or perhaps the fan resistor (they often go bad in some vehicles, although usually the highest speed still works), before trying to buy a new switch.