How do you replace a heater core?

HEATER CORE

Removal & Installation

1. Disconnect negative battery cable. Drain cooling system. Remove instrument panel. Remove junction block splash shield. See Fig. 187 . Remove bolts and disconnect cable ends from starter relay. See Fig. 99 . Remove bolts and position aside junction block bracket. See Fig. 100 . Disconnect heater hose couplings. See Fig. 152 .

2. Remove screw and A/C plenum demister adapter. See Fig. 153 . Remove screws and position aside relay bracket. See Fig. 154 . Disconnect A/C vacuum hose from A/C vacuum check valve. See Fig. 155 .

3. Remove 15 plenum chamber assembly top screws and remove plenum chamber top. See Fig. 156 . Remove temperature blend door assembly. Remove heater core from plenum. See Fig. 157 .

4. To install, reverse removal procedure. Lubricate coolant hoses with coolant hose lubricant or plain water only if needed. Fill and bleed cooling system. Check system for proper operation.