Rear HVAC Housing
Rear HVAC Housing
Review the applicable warnings and cautions for this system before performing the following operation.
• The rear HVAC housing must be removed from the vehicle for service of the mode door actuator, blend door actuator, blower motor and blower motor resistor and, it must be disassembled for service of the A/C evaporator, heater core, mode-air door and blend-air door.
Removing
- Disconnect and isolate the negative battery cable.
- Recover the refrigerant from the refrigerant system. Refer to => [ Refrigerant System, Recovery ] Refrigerant System, Recovery.
- Drain the engine cooling system.
- Raise and support the vehicle.
• Illustration shown with rear body cradle removed for clarity.
- Remove the nut (1) that secures the underbody refrigerant extension lines (3) and the sealing plate (4) to the rear A/C expansion valve (1) which extends through the floor panel behind the right rear wheel housing.
- Disconnect the underbody refrigerant extension lines from the rear A/C expansion valve and remove and discard the O-ring seals.
- Install plugs in, or tape over the opened underbody refrigerant line fittings and rear expansion valve ports.
Do not apply excessive force on underbody heater lines or rear heater hose quick connect fittings when disconnecting the connections. Excessive force may damage or deform the fittings and or lines, causing an engine coolant leak.
- Disconnect the underbody heater lines (4) from the rear heater core tubes (1) which extend through the rear floor panel in front of the right rear wheel housing by releasing the insert (2) in each rear quick connect fitting (3) and carefully pulling downward on the fittings while using a slight twisting motion.
- Lower the underbody heater lines and drain any residual coolant from the lines into a suitable container.
- Lower the vehicle.
- Remove right rear quarter trim panel..
- Remove the metal support strap from the rear quarter panel and floor.
- Remove the rear floor distribution duct. Refer to => [ Rear Floor Duct ] Rear Floor Duct.
- Remove the rear roof distribution ducts. Refer to => [ Rear Roof Duct ] Rear Roof Duct.
- Disconnect the body wire harness from the rear HVAC wire harness connector (6).
- Remove the two nuts (2) that secure the rear heater core tubes (8) to the floor panel (9).
- Remove the bolt (7) that secures the rear heater core tubes to the right inner quarter panel (1).
- Remove the two bolts (5) that secure the rear HVAC housing (4) to the two metal brackets (3) located on the rear inner quarter panel and remove the housing.
Installing
- Position the rear HVAC housing (4) into the vehicle.
- Install the two bolts (5) that secure the rear HVAC housing to the two brackets (3) located on the rear inner quarter panel (1). Tighten the bolts to 3 Nm (27 in lbs).
- Install the two nuts (2) that secure the rear heater core tubes (8) to the floor panel (9). Tighten the nuts to 3 Nm (27 in lbs).
- Install the bolt (7) that secures the rear heater core tubes to the rear inner quarter panel. Tighten the bolt to 3 Nm (27 in lbs).
- Connect the body wire harness to the rear HVAC wire harness connector (6).
- Install the rear roof distribution duct. Refer to => [ Rear Roof Duct ] Rear Roof Duct.
- Install the rear floor distribution duct. Refer to => [ Rear Floor Duct ] Rear Floor Duct.
- Install the metal support strap to the rear quarter panel and floor. Tighten the fasteners securely.
- Install the right rear quarter panel trim..
- Raise and support the vehicle.
- Lubricate new rubber O-ring seals with clean engine coolant and install them onto the rear heater core tube fittings. Use only the specified O-rings as they are made of a special material designed for use with engine coolant. Use only engine coolant of the type recommended for the engine in the vehicle.
- Connect the quick connect fittings (3) for the underbody heater lines (4) to the rear heater core tubes (1) and engage the inserts (2). Make sure the inserts are fully engaged to the rear heater core tube fittings.
- Remove the tape or plugs from underbody refrigerant extension line fittings and rear expansion valve ports.
- Lubricate new rubber O-ring seals with clean refrigerant oil and install them onto the rear underbody refrigerant line fittings. Use only the specified O-ring seals as they are made of a special material for the R-134a refrigerant system. Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.
- Connect the underbody refrigerant extension lines (3) to the rear A/C expansion valve (1).
- Install the nut (2) that secures the extension lines and sealing plate (4) to the to the rear A/C expansion valve. Tighten the nut to 23 Nm (17 ft lbs).
- Lower the vehicle.
- Connect the negative battery cable.
- If the heater core is being replaced, flush the cooling system.
- Fill the engine cooling system.
- Evacuate the refrigerant system. Refer to => [ Refrigerant System, Evacuate ] Refrigerant System, Evacuate.
- Charge the refrigerant system. Refer to => [ Refrigerant System, Charging ] Refrigerant System, Charging.
- Calibrate the HVAC control.