An auxiliary heater provides additional heating for the rear of the Suburban model.

This unit operates independently of the standard heater. The auxiliary heater controls in the instrument panel (auxiliary heater models) or in the roof panel (auxiliary heater and A/C models) regulate the auxiliary heater. The auxiliary heater system consists of a separate heater core and a separate blower fan unit mounted in the rear of the vehicle.

The location of the auxiliary heater blower switch is in the instrument panel to the right of the steering column (auxiliary heater models) or in the roof panel (auxiliary heater and A/C models).