Heating and Air Conditioning: Description and Operation

REAR AUXILLARY HEATER AND A/C

Front Climate Control Switches:

DESCRIPTION
The auxiliary system is a blow-through design that directs air through the heater core (18476) or the A/C evaporator core (19860) (if equipped). To allow for a separate A/C or heat control at the rear of vehicle.

OPERATION
Function selection for the auxiliary system is controlled by the function selector lever in the front A/C control (19980). When the function selector lever is in the MAX A/C, NORM A/C or VENT positions, air is directed to the rear overhead air conditioning duct and registers for trimmed vehicles, or the air conditioning and heat register located on the auxiliary heater and air conditioner assembly for untrimmed vehicles.

When the function selector lever is in the FLOOR, DEF/FLR or DEFROST positions, air is directed to the heater floor duct and registers for trimmed vehicles, or the heater register located on the auxiliary heater assembly for untrimmed vehicles.

The auxiliary system is a blow-through design that directs air through the heater core (18476) or the A/C evaporator core (19860) (if equipped). A vacuum actuated mode control door determines the direction of airflow through either the heater core or A/C evaporator core.