Replacement of the HVAC Air Filter

sd mm 83.02.001

The HVAC air filter must be replaced every six months or 60,000 miles (97 000 km) to permit proper operation of the HVAC system.

  1. With the vehicle parked, apply the parking brakes, and chock the tires.
  2. Remove the lower HVAC cover in the cab. For instructions, see  of the 108SD and 114SD Workshop Manual.
  3. Disconnect the wiring harness from the evaporator probe.
  4. Remove the capscrews that attach the evaporator service cover to the HVAC assembly. Remove the evaporator service cover.
  5. Pull the filter out of the HVAC assembly.
  6. Install a new filter in the HVAC assembly. Be sure that the arrow on the filter is pointing toward the evaporator. See Fig..

    Fig. 1, HVAC Assembly Filter

  7. Remove the condensate seal from the evaporator service cover and install a new condensate seal on the cover.
  8. Using capscrews, attach the evaporator service cover to the HVAC assembly.
  9. Connect the wiring harness to the evaporator probe.
  10. Attach the lower HVAC cover to the dash panel. For instructions, see  of the 108SD and 114SD Workshop Manual.
Note:
Parent topic: Heater and Air Conditioner
Document Number: 0000120134
Manual Publication Date: 2024-05-23
Topic Publication Date: 2024-10-30