1996 Jimmy A/C fan switch problem

The high spped on my fan switch stopped working. All other speeds work fine. What can cause this? Is it the fan switch itself or are there other things that could not be working? How would I check for the solution?

Thanks, Jeff

might be the blower motor resistor

The high spped on my fan switch stopped working. All other speeds work fine. What can cause this? Is it the fan switch itself or are there other things that could not be working? How would I check for the solution?

Thanks, Jeff

High speed fan is run off of relay.

First check fuses for it and power to relay and relay operation.

High speed fan is run off of relay.

First check fuses for it and power to relay and relay operation.
Do you know where the relay is located? Is the fuse in the fuse box with the rest of the fuses?

Jeff

The relay is right rear of engine compartment .
Wire ID to it is.
Red 12 volt power from fuse link 2.
Orange wire from ac control.
Black wire ground.
Dark wire blue from resistor block.
Purple wire feeds blower motor.

Ac fuse in IP panel fuse block.
Check fuse for 12 volt both sides key on.