S15/T15 Sonoma P/U 2WD V6-4.3L VIN X (1998)
Heater Core Case: Service and Repair
REMOVAL PROCEDURE
1. Remove the instrument panel. See: Body and Frame/Interior Moulding / Trim/Dash Board / Instrument Panel
2. Drain the engine coolant.
3. On vehicles with automatic climate control only, cut the outer layer of the A/C evaporator and blower module in order to access the service access
cover.
4. On vehicles with automatic climate control only, remove the service access cover mounting screws (1).
5. On vehicles with automatic climate control only, remove the service access cover (2).
6. On vehicles without automatic climate control, remove the blower motor resistor. Refer to Blower Motor Resistor Assembly Replacement (C42) or
Blower Motor Resistor Assembly Replacement (C60).
IMPORTANT: Mark and use the same mounting bolt for the heater/vent module during the installation process. Other mounting bolts are longer
and will obstruct the operation of the temperature door.
7. Remove the heat/vent module mounting bolt through the blower motor resistor or service access cover opening.
