Heater Blower Low Speed Not Working - Blower Motor Resistor Replacement

Heater/AC blower fan low speed does not work, while medium and high speeds function normally. This is caused by the blower motor resistor pack failing, specifically the thinnest highest-resistance coil breaking.

The blower motor resistor pack, located under the glove compartment, has a broken resistor coil. The thinnest, highest-resistance coil (1.3 ohm) is the one that typically fails. These wire-wound coils carry the full motor current and get hot; over time the wire breaks. This is an extremely common failure on the MK3 Supra.

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