Heater Core: Service and Repair

REMOVAL

WARNING:
- TO AVOID PERSONAL INJURY OR DEATH, ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE SUPPLEMENTAL RESTRAINT SYSTEM BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, AIRBAG, SEAT BELT TENSIONER, IMPACT SENSOR, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. DISCONNECT AND ISOLATE THE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MINUTES FOR THE SYSTEM CAPACITOR TO DISCHARGE BEFORE PERFORMING FURTHER DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THE SUPPLEMENTAL RESTRAINT SYSTEM. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT.
- REFER TO THE APPLICABLE WARNINGS AND CAUTIONS FOR THIS SYSTEM BEFORE PERFORMING THE FOLLOWING OPERATION. FAILURE TO FOLLOW THE WARNINGS AND CAUTIONS COULD RESULT IN POSSIBLE PERSONAL INJURY OR DEATH.

1. Remove the heater housing.
2. Disassemble the HVAC housing to access the heater core.

HVAC Housing:

3. Lift the heater core out of the lower half of the HVAC housing.
4. If necessary, remove the three heater core tube retaining bolts and the heater core tube assembly from the heater core.
5. Remove the heater core tube seals and discard as required.

INSTALLATION
1. If the heater core tube assembly was removed from the heater core, lubricate two new rubber O-ring seals with clean engine coolant and install them onto the heater core fitting.
2. If required, connect the heater core tube assembly to the heater core and install the three retaining bolts. Tighten the bolts to 5 N.m (45 in. lbs.).
3. Install the heater core into the bottom half of the HVAC housing.
4. Assemble the HVAC housing.

NOTE: If the heater core is being replaced, flush the cooling system.

5. Install the HVAC housing.