A/C & Heater Fan Switch

[BB501]

I have a 2002 P32 chassis. My Heater and A/C Fan switch has three speed positions. The first and second speeds work but the third (high) does not. Where would I start troubleshooting? At the switch? The Fan? Are there relays involved? Thank you.
Steve

[BB501]

I have a 2002 P32 chassis. My Heater and A/C Fan switch has three speed positions. The first and second speeds work but the third (high) does not. Where would I start troubleshooting? At the switch? The Fan? Are there relays involved? Thank you.
Steve

[cannon man]

the high speed settings usually are on a seperet cicuit with its own fuse. check dem fuses.

[BB501]

Cannon Man,
I would never have thought of a seperate circuit for high speed. Thank you. Steve

[John-D]

The Workhorse system is based on the GM system from which it was spun off. I have never shot trouble on the Workhorse but have on my 1992 Chevy

It uses one fuse, but for high speed it has a relay that cuts in

One thing.. If low and medium work it's not a wire or connection to the motor problem cause those wires are the same for all speeds Though a seperate fuse is possible, you may need to track down the high speed relay

[DriVer]

I just wanted to add that nothing related to the blower motor switch belongs to Workhorse. All of the dash controls are designed and installed by the coach builder.

[Full-Timers]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by DriVer:
I just wanted to add that nothing related to the blower motor switch belongs to Workhorse. All of the dash controls are designed and installed by the coach builder. </div></BLOCKQUOTE>
Designed by Evans and installed by the coach builder.

[max49]

BB501,
I think my fan has 4 speeds; but 'Hi" speed is definitly on a separate circuit. Mine is an inline fuse, in the engine compartment, right on the firewall in front of the drivers feet. Mine's a 30 amp fuse.