front blower motor

[Tom Williams]

The front blower only has 3 speeds now 4 will not work. I replaced the resistor on the blower motor, but that didnt help. Any ideas would be helpful. Thanks Tom

 

[Kevin Palmer]

Well, the first three speeds are the only speeds that use the resister. The forth speed is full speed and has a direct (non-resisted) speed. Since the blower is working it shows that power is getting to it. I would think you have an issue with the switch. Run a hopper wire to the plug of the blower. If it goes full blast than you need to take a look at the switch to see if you have a connection issue or a defective switch...

 

[Tom Williams]

Thanks for the info, I will look into it. Tom

 

[Todd Z]

Most of the fords today do use the resister block for the high. What happens is the plug gets corroded inside and looses connection...

Need to take a test light and turn the switch and test each lead from the plug...

The plug should have 4 connectors on it...

Some vehicles use a high relay for the high setting..

Todd Z

 

[Evan F]

I would replace the A/C control head