My 2006 F-150's AC only works on the highest setting. On any other setting it doesn't work at all. Any idea of what the problem could be?

Last year only two of the settings worked and now just one.

 

Blower motor resistor is out.

 

+2 it needs a resistor for the switch had to replace mine on my old truck for the same exact reason

 

Quick and easy fix.

This is the one I bought to fix my '08.

 

I've done that fix and it's easy. Bought the part from Tasca and installed it in about 5 minutes. Believe it's behind the glovebox area

 

Thanks everyone! I ordered the part off Amazon. Hope this fixes the problem.

 

That must the noise I'm starting to hear behind the dash, is that right ?

 

No, it doesn't make a noise, the fan just stops working on different settings.

 

I replaced the blower resistor and that fixed the problem. Thanks everybody!

 

Mine was the same. Only working in position 3 and 4. New resistor pack was 50.00 Canadian with taxes. Quick and easy install. All speeds working again. Video was great showing exactly where the resistor was. Thanks to all.