Check your fuse #23 Blower motor fuse, then your fan switch, since you have already stated that you have NO SPEEDS. You can test resistance on your fan switch, I found it easier like I said earlier to test a new one while at the parts store. Replacing the Blower Motor Resistor is easy also like the last poster said, and yes they are quite a common failure due to the moisture in the fan box causing them to corrode.
Blower Motor Resistors will loose lower fan speeds as they start to fail, The High Fan Speed bypasses the resistors on the board, still allowing for HIGH SPEED fan operation.
Start with you Fuses, working your way down the line
(fuse, fan speed control, blower motor resistor, blower motor)
I have seen your conditions caused by the electrical connection at the blower motor resistor being corroded. Unplugged the connector, sprayed it with electrical spray cleaner and it was good as new.
A Haynes Manual walks you through testing procedures, well worth the 19 bucks, cheaper than throwing parts that aren't needed.
Last edited by sharptp; 02-02-2011 at 12:20 AM.