Sensors (Four)

Solar Sensor
The solar sensor, which is located in the right-hand loudspeaker grille on the dashboard, measures the incident sunlight.The device can compensate the interior temperature by a maximum of 3 °C (5 °F).

Interior Temperature Sensor
The interior temperature sensor, which is located in the root light, measures the temperature in the passenger compartment at head level. The device is ventilated by means of a tube from the intake manifold, through which air is drawn through the sensor.





Water Temperature Sensor
The water temperature sensor at the heater actually measures the air temperature immediately adjacent to the unit. This prevents the blower from starting at the highest speed in the automatic mode before the coolant has begun to heat up. The blower speed increases gradually with coolant temperature.

Operation When There is a Fault
The system functions even if a sensor is faulty. To prevent the entire unit from being disabled if a sensor becomes faulty, the system is programmed to continue operating in a more or less normal manner in this event. However, it will react more slowly and will control the temperature less precisely.

The A/C button will flash to Indicate the presence of a fault (not, however, a solar sensor fault).

Ambient Temperature Sensor
The ambient temperature sensor, which is mounted on top of the blower housing, measures the temperature of the inlet air. Thus, during recirculation, the sensor measures the temperature of the air drawn from the interior of the car.

NTC Resistor and Photocell
The ambient, interior and water temperature sensors are resistors of the NTC (negative temperature coefficient) type, the resistance of which falls with rising temperature. The resistance is 9.9 k Ohms at 25 °C (77 °F).

The solar sensor is a photocell.