January 21, 201115 yr I have a 88 GL Wagon. My heater blower motor only runs on full blast (4). I have replaced the switch that controls the motor speed, but it still only works on full blast. Anyone know what might be happening and what the problem may be? Is there a relay somewhere? I am at a loss. Thanks
January 21, 201115 yr There is a resistor coil that controls the 1-3 spds. #4 spd bypasses the resistor for full power. The resistor il=s located in the passenger side footwell, just undwer the glovebox. Remove the kickpanel trim, and you will see a rectangle with 2 screws and a wire lust below and to the left of the fan motor.
January 22, 201115 yr You will most likely discover (as I have) that those little coils have disintegrated. Next you will discover that a replacement is pricey. Fortunately, this issue came up a few year's ago, and a solid-state solution was posted. http://www.ultimatesubaru.org/forum/showthread.php?t=14184&highlight=resistor I've tried this and it works great. Good luck.
February 5, 201115 yr funny thing happened with my heater.. it had the same symptoms.... it would only work on high.. then it quit working all-together... i tested the wire harness and electricity was reaching the heater motor so i pulled the heater motor out and figured it was shot... my friend had a large very powerful battery charger and suggested we test it before replacing.............. hooked it up to the charger and WOW it worked fine........ i reinstalled the heater motor and tried it again... it did not work... we then retested the wires and they checked out fine...... i pulled the heater motor and tested it again on the powerful battery charger... and it worked but was spinning a little slower..... i plugged the motor back into the whirring harness again and the fan motor still did not work.... i then took the heater motor apart and found only one brush was making contact the other brush had worn down to the wire.. this caused the motor to require twice the amount of electricity to make it spin... explained why the motor ran on the high powered charger but not off the battery i went to the John-Deer dealer and bought a set of brushes and the heater now works just fine... lol
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