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... and the two wire might be for the fan heater/ac fan speed, because the fan only works on the highest setting not any of the other settings. Anybody know for sure?


That's not it.
Your fan isn't working on all speeds because the resistor pack is bad. It's mounted in the ductwork under the dash. You'll see a 3-4 wire connector going into a duct. When you pull out the entire thing it will look like 3 coils of wire inside. They are the fan speed resistors, and are bad.

- seen in FOUR WHEELER mag July 2006 & OFF-ROAD mag Feb 2007 -
'84 4Runner ARBed 5.29s F&R,4.7 & 2.28 t-cases,hy-steer,BudBuilt skid,30spl Longs,36" TSLs,Chevys

'83 P/U, Buick 231 V6,Holley 4 bbl,Weiand intake,Downey headers,TH350 w/700R4 gearset