Heater Core: Service and Repair
HEATER UNIT / CORERemoval Procedure
1. On models equipped with airbag system, refer to Technician Safety Information for system disarming and arming procedures.
2. Disconnect battery ground cable, drain cooling system.
3. On models with A/C, discharge and recover A/C system.
4. Remove instrument panel as outlined in Dash Panel section.
5. On models with A/C, proceed as follows:
a. Remove evaporator to compressor and receiver tank flare nuts.
b. Disconnect resistor connectors.
c. Remove three evaporator retaining nuts, then the evaporator assembly.
6. Disconnect heater hoses from heater core, then remove side ventilator duct.
7. Remove four heater unit retaining nuts, then the heater unit assembly.
8. Remove defroster door rod and lever.
9. Remove plate and seal, then the heater core.
10. Reverse procedure to install, noting the following:
a. Torque evaporator to receiver tank nut to 10-20 ft. lbs.
b. Torque evaporator to compressor nut to 20-22 ft. lbs.
11. On models equipped with airbag system, refer to Technician Safety Information for system disarming and arming procedures.