How to replace a car heater blower motor

Written by don bowman
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How to replace a car heater blower motor
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The heater blower motor in any vehicle is located in the HVAC module. This module is a plastic box that houses the evaporator for the air conditioning and the heater core. A series of doors open or close as controlled by the control panel, to direct air in the proper direction from the blower motor. The blower motor is operated through the control panel, a relay and fuse, and a blower motor resister. The resister gives the control panel the ability to control fan speeds.

Skill level:
Moderately Challenging

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Things you need

  • 1/4-inch drive ratchet
  • Set of 1/4-inch drive sockets

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  1. 1

    Locate the heater blower motor. The majority of vehicles have the HVAC module under the dash on the passenger side. The blower motor is located close to the passenger-side kick panel under the module with the blower fan up. The motor is bolted to the bottom of the module. Some trucks and SUVs have the blower motor under the bonnet on the passenger side close to the fender. Some Cadillacs such as the Fleetwood with the Northstar engine have the HVAC module in the centre of the firewall and the motor located in the middle.

  2. 2

    Remove the lower dash cover to gain access to the blower motor, for the most common inside mounting of the blower motor. Disconnect the electrical connector that is plugged into the blower motor by depressing the plastic clip and pulling it out. This is the procedure regardless of location.

  3. 3

    Remove the four screws around the circumference of the blower motor. These screws secure the blower motor to the module. Lower the blower motor out of the module. In some cases, if the blower motor will not come completely out of the module, pull the carpet back enough to lower the blower motor a little further.

  4. 4

    Remove the blower motor fan from the blower motor. This requires taking a small nut off the end of the shaft with a small socket or pulling a spring clip off the end of the shaft. Lift the fan off and place it on the new motor. Replace it in the module in reverse order of removal.

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