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Replacing the switch isn't too bad, but more likely the blower resistor is bad. If like the earlier trucks, it sits up behind the blower motor and is held in place by a phillips screw, with a plug and about 3-4 wires going to it. Looks like a bunch of little coils.

Dealer or junkyard part.

Usually only works on high speed when the resistor packs it in as the high fan speed is direct power without any resistance.


Correct, when one of the resistors opens up you will loose one of the lower speeds, but you'll always have the highest speed.
It would still be wise to pull the resis module and check it, but it doesn't sound like the culprit in this case.

- 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