Heater Core: Service and Repair

Less Air Conditioning
1. Disconnect battery ground cable and drain cooling system.
2. Disconnect heater hoses from heater core tubes. Cap tubes to prevent leakage of coolant.
3. Remove I/P from vehicle as described under ``Instrument Panel, Replace.''
4. Remove three heater case mounting nuts, then the heater case by pulling it straight out.
5. Reverse procedure to install.

With Air Conditioning
1. Remove heater case as follows:
a. Remove I/P as described under ``Instrument Panel, Replace.''
b. Drain coolant and disconnect heater hoses from extension tubes.
c. Remove evaporator case as described under ``Evaporator Case, Replace.''
d. Remove three heater case mounting bolts.
e. Remove heater case by pulling straight out, use caution not to bend extension tubes.
2. Remove two heater core tube brace attaching screws, then the tube braces and heater core from case.
3. Reverse procedure to install.