With A/C
Heater Core Removal and Installation- Drain the cooling system.
- Disconnect the negative (-) terminal from the battery.
CAUTION: Automotive refrigerant containing CFC's is hazardous to the earth's atmosphere. To protect our environment, use an Underwriter's Laboratory (UL) approved refrigerant recovery/recycling unit such as Kent-Moore ACR3, or equivalent, whenever discharging an A/C system.
NOTE: Characters in ( ) denote applicable points in the image.
(1) Evaporator
(2) Expansion valve
(3) Sight glass
(4) Receiver/drier replace if system is contaminated or system has been open for several hours
(5) Pressure relief valve
(6) Condenser
(7) High pressure switch
(8) High pressure service valve
(9) Low pressure switch
(10) Oil drain plug
(11) A/C compressor
- Remove protective caps from A/C service valves.
- Close both valves on A/C manifold gauge set.
- Connect hose 1 from low pressure gauge to low pressure service valve.
- Connect hose 3 from high pressure gauge to high pressure service valve.
- Connect manifold gauge hose (2) to inlet connection (4) on refrigerant recovery recycling unit (5).
CAUTION: Always follow manufacturer's instructions when using a refrigerant recovery/recycling unit.
- Following manufacturer's instructions, discharge A/C system into refrigerant recovery/recycling unit.
- Close manifold gauge valves when refrigerant is fully discharged.
- Disconnect manifold gauge set hose from service valves.
- Reinstall protective caps on service valves.
CAUTION: Do not leave A/C system open for long periods of time. Prolonged exposure to the air will contaminate the system and necessitate replacement of receiver/drier and possibly other system components.
- Disconnect electrical connector from A/C compressor clutch, to prevent accidental compressor operation while system is discharged.
- Remove the instrument panel. Service and Repair
- Remove coolant reservoir (A) from bracket (B).
- Position reservoir below level of hose (C).
- Remove harness tie straps at heater hoses.
- Disconnect coil wire (D) for access to heater hose.
- Remove heater hoses.
- Plug heater core pipes to prevent antifreeze spills during heater housing removal.
- Remove air intake boot at throttle body.
- Remove A/C suction line clamp (A)
- Disconnect A/C lines at expansion valve (B), cap openings immediately.
- Remove heater housing fasteners (arrows) in engine compartment.
- Remove defroster duct (A).
- Remove instrument panel support bracket (B).
- Remove heater housing assembly.
- Remove the heater core.
NOTE: Installation is in reverse order of removal and includes the following additional steps:
- Install new seals at:
^ A/C inlet/outlet lines at evaporator core, and heater core
^ Air intake duct
^ Air distribution case
^ Other seal locations, as necessary
- Apply silicone sealer (available locally) to mating surface of:
^ Fresh air blower housing
^ Air intake duct
^ Evaporator housing (upper)
- Evacuate and recharge A/C system.
- Replenish coolant to specifications.