freightliner MT45 2019 - Heater System Operations; Motor, Fan, and Plenum Replacement

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2019 Amazon P80 Package Delivery Vehicle

Heater

Motor and Fan Replacement:

1. The heater is mounted to the right hand dash panel.

2. With the power to the motor off, disconnect the motor leads.

3. Remove motor mounting screws. Remove the motor and the impeller wheel.

4. Take out the set screw to remove the impeller wheel (squirrel cage).

5. For installation, reverse the sequence.

Plenum Replacement:

1. Detach air inlet hose from plenum.

2. Disconnect wiring harness at heater box and instrument panel harness.

3. Remove fasteners from plenum diffuser (located on top of the windshield rail).

4. Remove the fasteners located on top of the windshield rail.

5. Installation sequence is opposite of removal.

Plenum