Before servicing the vehicle, refer to the Precautions Section.
NOTEDisconnecting the negative battery cable on some vehicles may interfere with the functions of the on-board computer systems and may require the computer to undergo a relearning process, once the negative battery cable is reconnected.
NOTEIf working near and/or around the SRS system and components, be sure to properly disable the SRS system. See disarming/arming the SRS system.
- Disconnect the negative battery cable.
- Properly discharge the air conditioning system.
- Disconnect and plug the freon lines.
- Drain the engine coolant. Be sure to properly dispose of used coolant.
- Disconnect and cap the heater hoses.
- Disconnect and cap the refrigerant lines at the evaporator ports. Discard the O-rings.
As necessary remove the instrument panel assembly to gain access to the component.
- Remove the floor air outlet assembly.
- Disconnect the required electrical connectors, vacuum lines and cables from the component.
- Remove the retaining bolts and nuts from the engine compartment, first.
- Remove the component retaining nuts and bolts from inside the passenger-s compartment.
- Slide the assembly rearward, tilting as required to ensure that the heater core tubes and evaporator core tubes are clear before removing the unit from the mounting studs.
- Remove the heater/AC module from the vehicle.
Remove the heater core from the case assembly.
- Installation is the reverse of the removal procedure.
- Be sure to properly recharge the air conditioning system.
- Be sure to fill the cooling system with the proper grade and type engine coolant.
- Using the GM diagnostic scan tool or aftermarket equivalent reprogram the necessary systems and components. Be sure to follow the scan tool manufacturer-s directions.