blower motor resistor

melsg5

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blower resister is blown, remove it and look for a broken coil
 

omologato

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Weird, usually when the resistors go you only get high speed.

Basically there are separate resistors for each speed, the lowest setting has the most resistance to limit power to the motor and spin it slower. With the fan on high the power should run directly to the blower motor and through nothing besides a fuse, but if the fuse was bad you wouldn't have any speeds.

Try checking the switch assembly to see if you have continuity through the switch for each speed. If the switch works fine then 2 of the 3 resistors are bad and possibly the large wire for high speed is bad also or has poor contact, they can melt sometimes making bad contact.

The resistors are as Mels say, wire wound so they look like a coil of solid core wire. Be careful they get hot, the lowest speed will get the hottest as it has to dissipate the most power and that still functions so be careful if you run it while messing around with the resistors.

Try running a wire from battery to the blower motor to see if it spins full speed.
 
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