GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 890171  Size: SH
  1. Unclip the heater wire harness from the headlamp tab (1).
  2. Unclip the heater wire harness below on the outside of the battery (2).

  3. Object Number: 890179  Size: SH
  4. On vehicles with automatic transmission, unclip the heater wire harness (1), from the main wire harness.

  5. Object Number: 890190  Size: SH
  6. On vehicles with manual transmission, unclip the heater wire harness from the main wire harness (1).

  7. Object Number: 890193  Size: SH
  8. Unclip the heater cartridge from the engine block.

Installation Procedure


    Object Number: 890193  Size: SH
  1. Fully seat the heater cartridge against the engine block and ensure the clip snaps in place. The final wire harness should be in the 8 o'clock position. The final retaining clip location should be in the 3 o'clock position.
  2. Route the wire harness along the rear of the engine aligned with the heater hose tube.
  3. Ensure the wire harness cartridge plug is fully seated onto the cartridge.
  4. Ensure the main wire harness clip is fully seated.

  5. Object Number: 890190  Size: SH
  6. On vehicles with manual transmission, route the heater wire harness (1) as shown.

  7. Object Number: 890179  Size: SH
  8. On vehicles with automatic transmission, route the heater wire harness (1), as shown.

  9. Object Number: 890171  Size: SH
  10. Tuck the heater wire harness below the junction box on the outside of the battery.
  11. Tuck the 110 volt heater plug in the space in between the battery and headlamp assembly (1).
  12. Clip the heater wire harness on the outside of the battery (2).
  13. Ensure that the 110 volt plug tie-strap securely holds the wire bundle and the protector cap is fully seated on the plug.