90 Quattro 20V (Canada) L5-2309cc 2.3L DOHC (7A) (1989)
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Cabin Temperature Sensor / Switch: Description and Operation
The climate control system uses two interior temperature sensors.
A) Interior Temperature Sensor G56 With C) Suction Fan V42
Temperature sensor # 1 (G56) is located in the dashboard. A small suction fan is used to draw interior air over the sensor to ensure accurate
measurement. The fan operates when the ignition is ON.
Interior Temperature Sensor, Roof
Temperature sensor # 2 (G86) is mounted next to the front interior dome light. This sensor has the same resistance values as the sensor in the dashboard.
The Climate Control Head receives the signals from both sensors and uses a value in between to calculate the interior temperature.
