Temperature. Sensor. Coolant. Sending Unit. water. Engine.
From 12/1984. Temperature Sensor for Engine Coolant. To 10/1992.
Engine Coolant Temperature Sensor
318, 325. 525, 535, 530, 540. 635, M6, 735. 735. M3. W/635CSi, 735i.
Engine Coolant Temperature Sensor - Repair or Replace
If your engine coolant temperature sensor has failed, you may notice one of several symptoms: your temperature gauge doesn’t move, your engine overheats without warning, your radiator fans don’t switch on, or they don’t switch off. If your has any of these symptoms, it's a good idea to let a trained technician perform an inspection.