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Old 11-02-2014, 05:27 PM   #1
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The in dash heater/ac fanů..

ů..in our 2010 Damon Astoria doesn't work in the high speed selector position. At medium and slow speeds, it works fine.

Is that a precursor for the fan or switch to completely fail?

It's been this way for about 15000 miles.
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Old 11-02-2014, 06:03 PM   #2
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There is a resistor pack on most HVAC fans to control the speed, most of the time if there is a problem it will only run on high speed. If you can find the motor on the firewall trace the wires and they should lead you to the resistors.
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Old 11-02-2014, 06:45 PM   #3
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The resistor pack is usually in the air stream of the plenum to disperse heat of the resistors. When the resistors burn out, the fan defaults to high speed. Since you don't have high speed, it sounds more like a bad switch. Check with a multimeter to be sure. Often the switch is part of the whole HVAC control and the switch can't be replaced independently. Often the HVAC panel used in your RV is also used in numerous other vehicles, so you might be able to find in an auto salvage yard, or check some of these sources:

RV Salvage/Surplus Yards (List) Updated 11/1/14 - RV Forums - myRVparks.com
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