Tools Required

J 39500-B R-134a Refrigerant Recovery, Recycling and Recharging (ACR4) System

Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

1. Disconnect the negative battery cable.
2. Use the J 39500-B in order to recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
3. Drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
4. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
5. Disconnect the heater hoses from the heater core.
6. Remove the evaporator fitting from the evaporator.

Discard the O-ring seals.

7. Remove the moisture drain tube from the HVAC module.
8. Lower the vehicle.
9. Remove the instrument panel and console. Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gages and Console.
10. Remove the heater outlet cover.
11. Remove the heater core cover. The heater core cover mounting screw is located in a recess in the center of the cover.
12. Remove the following components:

•	The heater core mounting clamps

•	The heater core

13. Remove the following components:

•	The heater core shroud

•	The evaporator core

14. Remove the evaporator core.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

1. Install the evaporator. If you are installing a new evaporator, refer to Refrigerant Oil Distribution .

Tighten
Tighten the screws to 1 N·m (9 lb in).

2. Install the following components:

•	The heater core shroud

•	The heater core

•	The heater core mounting clamp

Tighten
Tighten the screws to 1 N·m (9 lb in).

3. Install the heater core cover.

Tighten
Tighten the screws to 1 N·m (9 lb in).

4. Install the heater core outlet cover.

Tighten
Tighten the screws to 1 N·m (9 lb in).

5. Install the instrument panel and console. Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gages and Console.
6. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
7. Install the moisture drain tube to the HVAC module.
8. Install the evaporator fittings to the evaporator. Use the new O-ring seals. Lubricate the seals using a clean 525 viscosity refrigerant oil.

Tighten
Tighten the screws to 24 N·m (18 lb in).

9. Connect the heater hoses to the heater core.
10. Lower the vehicle.
11. Fill the cooling system. Inspect for leaks. Refer to Leak Testing .
12. Evacuate and charge the A/C system. Refer to Refrigerant Recovery and Recharging
13. Connect the negative battery cable.

Tighten
Tighten the bolt to 16 N·m (12 lb ft).