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In order, the most common cause of failure on the blowers is failure of the brushes on the motor itself. The motor is completely open to the elements as air comes in (ie, no cabin filter) and can get water and rust. Check the fuses. If both have failed simultainiously, odds are that the left side one is dead and is causing the right one to fail as well (the left sends the signal to the right, the incoming air temperature sensor is in the left side one, making it the "primary" box). There are several relays in each blower box that can fail from water damage, and a capacitator in the bottom of the blowers that sometimes fails. The module in the center console rarely fails, but can fail to send signal to the "piano" computer (it looks like a grand piano, its the climate control computer) located on the left side of the box containing the evaporator and heater matrix. The connections on the piano computer can fail, and the computer itself can fail. Rarely as well, the feed wires at the fuse box can short and melt, causing a loss of power in the entire circuit.

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โˆ™ 2007-10-21 08:33:28
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Q: What causes the AC Heater blower fan to stop working on a 1989 XJ6?
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