1987 Ford Truck heater control switch

1987 FORD TRUCK
112,548 MILES • V8 • 4WD • AUTOMATIC
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my heater control switch only works on the lowest setting nomatter what setting you move it to. I replaced the blower motor, thinking maybe somthing was wrong with it from advise from a backyard mechanic. could you please point me in the right direction on what to do next. thanks for your time.
Nov 8, 2008 at 11:42 AM
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MIKE H R
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Under the hood disconeect the heater motor connection. With a static light chec to see if there is a difernce in voltage when the switch it turned up or down. If no diference check the fan switch control under the dash.
Dec 16, 2008 at 8:36 PM