Heater Core: Service and Repair
HEATER COREREMOVE OR DISCONNECT
1. Battery negative (-) cable.
^ Partially drain coolant
2. Glove box unit and right-side sound insulator.
A. Open glove box door and remove four screws.
B. Remove glove box electrical connectors and glove box.
C. Remove five screws and two wing nuts retaining sound insulator.
D. Courtesy lamp socket from sound insulator and insulator from vehicle.
3. Radio.
4. Programmer and electrical connectors.
5. Electrical connections from ECM.
6. ECM and mounting bracket.
7. Heater core cover.
8. Inlet and outlet heater hoses from heater core.
9. Two heater core retaining screws.
10. Heater core.
INSTALL OR CONNECT
1. Heater core to heater case, securing with two screws.
2. Inlet and outlet heater hoses to heater core.
3. Heater core cover.
4. ECM mounting bracket, ECM and electrical connectors.
5. Programmer and electrical connections.
6. Radio chassis.
7. Glove box unit and right-side sound insulator.
A. Install sound insulator to vehicle; install courtesy lamp.
B. Install two nuts and five screws, securing sound insulator.
C. Install glove box unit and electrical connector; secure with four screws.
8. Battery negative (-) cable.
^ Refill cooling system.
ADJUST
^ Perform the "Air-Mix Valve Adjustment" procedure.
AIR MIX VALVE ADJUSTMENT
ECC Programmer Linkage:
1. Remove right-side sound insulator and glove box.
A. Remove five screws and two wing nuts retaining sound insulator.
B. Remove courtesy lamp from sound insulator and insulator from vehicle.
2. Set the ECC temperature control to 32°C (90°F). Allow one to two minutes for the programmer arm to travel to its maximum heat position.
3. Unsnap threaded rod from the plastic retainer on the programmer output arm.
4. Check the air-mix valve for free travel (push the valve to maximum A/C position and check for binding).
5. Pre-load air-mix valve in the maximum heat position by pulling the threaded rod to ensure that the valve is sealing. The programmer arm should be in the maximum heat position.
6. Snap the threaded rod into the plastic retainer on the programmer arm. Do this carefully to avoid influencing the programmer arm of air-mix valve position.
7. Set the temperature setting on the control panel to 16°C (60°F). Verify that the programmer arm and air-mix valve travel to the maximum A/C position.