A4. S4; To5400000. Color-Green. From Chassis/VIN 1C-X-430 801. From Chassis/VIN 3B-X-491 581. From Chassis/VIN 9M-X-037 641. Temperature Sensor for Engine Coolant. Engine Coolant Temperature Sensor. Fan Switch. Temperature Sending Unit. TEMPSENDER. Thermostat Switch.