My 2002 mecury villager (same as nissan quest) from the time it was new would blow out the heater blower speed control resistor approx. every six months. Now they are only lasting a couple of weeks untill they fail. My friend has the same van purchased at the same time and he has the same problem. Is anyone aware of this problem and the solution? Thanks>
Not sure about the Villager, but many Ford resistor packs are mounted in the ventilation air flow and have a thermal fuse integral with the resistor pack. If the thermal fuse gets too hot (from inadequate air flow) the thermal fuse opens and the fan won't work in any position. The main suspicion falls on the blower motor, particularly the bearings, but anything that prevents the air from circulating will do it.
Mike
Heater fan motors don't "just quit", the bearings slowly dry out and get bad, and the amp draw goes up as the fan slows down... Check the motor bearings, and that the fan wheel isn't rubbing on the housing.
Some full-service Auto Electric shops (alternator and starter rebuilders) can also repair those small motors for less than new, call around.
It's all a matter of whether the motor is designed to be disassembled without destroying it (IE the case halves are welded together at the factory) and whether they can get the parts.
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