Envoy 2WD V6-4.3L VIN W (1998)
Heater Core: Service and Repair
Removal Procedure
1. Remove the instrument panel.
2. Remove the air inlet grille panel.
3. Remove the underhood lamp, if equipped.
4. Remove the hood.
5. Remove the antenna.
6. Remove the VCM.
7. Drain the engine coolant.
8. Remove the coolant recovery reservoir.
9. Remove the heater hoses from the heater core.
10. Remove the right headlamp assembly.
11. Remove the outer fender.
12. Remove the battery.
13. Remove the battery tray.
14. Remove the wheel house panel.
15. Remove the A/C lines from the evaporator.
16. Remove the heater case heat shield.
17. Remove the heater case fasteners (inside the vehicle).
18. With an assistant inside, gently pry back on the heater case while removing the evaporator housing assembly in order to ensure the clearance of
stud.
19. Remove the heater case.
20. Remove the heater assembly studs inside the engine bay.
21. Remove the heater box retaining screws.
22. Remove the heater box from the vehicle.
23. Remove the heater core access cover retaining screws.
24. Remove the heater core access cover.
