Heater/Vent Module Replacement for Chevrolet Cavalier 1998

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. Drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
3. Disconnect the heater hoses at the heater core.



4. Remove the module bolts.
5. Remove the instrument panel. Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gauges and Console.
6. Remove the instrument panel tie bar. Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gauges and Console.
7. Remove the floor air outlet.
8. Disconnect the wiring harness from the module.
9. Disconnect the electrical connections at the following locations:

•	The blower motor

•	The blower resistor

10. Remove the module (1) from the vehicle.

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 module (1) to the vehicle.

Tighten
Tighten the bolts to 3 N·m (27 lb in).

2. Connect the electrical connections at the following locations:

•	The blower motor

•	The blower resistor

3. Connect the wiring harness to the module.
4. Install the floor air outlet.
5. Install the instrument panel tie bar. Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gauges and Console.
6. Install the instrument panel. Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gauges and Console.
7. Install the module bolts. First, connect the upper bolts, then connect the lower bolts.

Tighten
Tighten the bolts to 3 N·m (27 lb in).

8. Connect the heater hoses at the heater core.
9. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
10. Connect the negative battery cable.

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