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Home >> Kia >> 2017 >> Forte S >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Blower System >> Power Mosfet >> Repair Procedures >> Inspection

Repair Procedures: Inspection

  1. Turn the ignition switch ON.
  2. Manually operate the control switch and measure the voltage of the blower motor.
  3. Select the control switch to raise the voltage until high speed.
    Fig 1: Measuring Power Mosfet Voltage
    G12166767Courtesy of KIA MOTORS AMERICA, INC.
    MOTOR VOLTAGE SPECIFICATION

    Fan Speed Motor Voltage (V)
    Manual Fan Speed Auto Fan Speed
    1 3.4 Max. 4.5
    2 4.9 4.5 - 5.5
    3 6.1 5.5 - 6.7
    4 7.2 6.7 - 7.7
    5 8.3 7.7 - 8.9
    6 9.5 8.9 - 10.1
    7 11.3 10.1 - 11.3
    8 B+

    * Manual Fan Speed: 3.4V - B+

    * Auto Fan Speed: 4.5V - B+

  4. If the measured voltage is not within specification, substitute with a known-good power mosfet and check for proper operation.
  5. Replace the power mosfet if it is proved that there is a problem with it.
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