Blower Motor Resistor: Service and Repair

Inspection

1. Ignition "ON"
2. 2. Manually operate the control switch and measure the voltage of blower motor.
3. Select the control switch to raise voltage until high speed.




Specification





*AUTO COOLING: Auto speed (4.5V~B+)
*AUTO HEATING: Auto speed (4.5V~11.0V)
4. If the measured voltage is not specification, substitute with a known-good power mosfet and check for proper operation.
5. If the problem is corrected, replace the power mosfet.

Replacement

1. Disconnect the negative (-) battery terminal.
2. Disconnect the power mosfet connector (A) and then remove the power mosfet (B) after loosening the mounting screws.




3. Installation is the reverse order of removal.