Heater Core: Service and Repair

HEATER UNIT REMOVAL

1. Disconnect negative battery cable from battery.
2. Discharge refrigerant in refrigerant system.
3. Remove cooling unit.Service and Repair
4. Drain engine coolant from radiator and engine drain cocks.

5. Remove water hose from heater unit.
(a) Remove the clamp and the control cable from the water valve.
(b) Remove 2 bolts and the water valve.

(d) Grip the claws of the hose clip with pliers and slide the clip along the hose to a place where it does not clamp the hose to the pipe.
(e) Disconnect the water hose from the heater unit.

6. Remove Driver's seat and Passenger's seat.

7. Remove instrument panel and console box duct.
8. Remove instrument panel brace and reinforcement.

9. Remove heater unit.
(a) Remove the 2 bolts and 2 nuts and the heater unit.

HEATER UNIT DISASSEMBLY

1. Remove air outlet damper control servomotor.
(a) Remove the 3 screws and the air outlet damper control servomotor.
2. Remove heater air duct.
(a) Remove the 2 screws.
(b) Loosen the 2 claws and the remove heater air duct.
3. Remove air mix link cover.
(a) Remove the 3 screws and the air mix link cover.

4. Remove max cool damper control servomotor
(a) Remove the clamp and disconnect the shaft.
(b) Disconnect the connector.
(c) Remove the 2 screws and the max cool damper control servomotor.

5. Remove air mix damper control servomotor
(a) Remove the clamp and the water valve control cable.
(b) Remove the clamp and disconnect the shaft.
(c) Remove the 3 screws and the air mix damper control servo motor.
6. Remove engine coolant temperature sensor.
(a) Disconnect the connector.
(b) After pulling off the clamp, pull out the sensor.
7. Remove heater radiator unit(heater core).
(a) Remove the 5 screws and the pipe clamps.
(b) Pull out the heater radiator unit with the 2 heater return pipe.

INSTALLATION

1. Reverse procedure to install.

Note: Set the water valve lever on Max Cool, connect the water valve control cable on the white mark and lock clamp.