Control Assembly: Description and Operation

This ATC system uses a combination of electrical and mechanical controls. These controls provide the vehicle operator with a number of setting options to help control the climate and comfort within the vehicle.

A/C Heater Control Panel:

The A/C-heater control panel is located on the instrument panel inboard of the steering column and below the radio. The A/C-heater control panel contains a rotary-type temperature control knob, a rotary-type mode control knob, a thumbwheel-type blower motor speed control and an air conditioning compressor push button switch and indicator lamp. The A/C-heater control panel also features a push button switch and indicator lamp for the residual engine heat utilization (REST) function, cabin heater or the heater booster (as equipped).

The A/C-heater control panel cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.

To control the interior temperature, the A/C-heater control module uses the actual values from the temperature sensors and the CAN bus and compares them with the nominal value of the temperature control switch.

The A/C-heater control panel is serviced only as complete unit and cannot be repaired. If faulty or damaged, the entire control panel unit must be replaced.