The coolant temperature sensor is necessary for timely notification of engine overheating. Its task is to measure the temperature of the coolant and transfer data to the electronic control unit. Based on the data obtained, the corresponding commands are sent to the units and mechanisms that regulate the ignition timing, crankshaft speed, the amount of fuel in the fuel-air mixture and other important parameters. In some car models, this device is used to switch to an electric ventilation cooling system.

1. FIESTA II (FBD)
2. FIESTA Mk II (FBD)
3. ESCORT III (GAA)
4. ESCORT IV (GAF, AWF, ABFT)
5. ESCORT Mk IV (GAF, AWF, ABFT)
6. ORION II (AFF)
7. ORION Mk II (AFF)
8. SIERRA (GBG, GB4)
9. SIERRA Hatchback (GBC, GBG)
10. FIESTA III (GFJ)
11. FIESTA Mk III (GFJ)
12. FIESTA Van (F3L, F5L)
13. COURIER Van (F3L, F5L)
14. ESCORT V (AAL, ABL)
15. ESCORT Mk VI (AAL, ABL)
16. ORION III (GAL)
17. VERONA III (GAL)
18. ESCORT III Convertible (ALD)
19. ESCORT Mk III Convertible (ALD)
20. ESCORT IV Convertible (ALF)
21. See more in applications

The coolant temperature sensor construction

The HELLA brand Sensor, coolant temperature consists of a plastic case with a metal thread, in which there is a thermistor, which is a resistor. The resistance of the resistor decreases as the temperature rises. To provide accurate information, the device must be in direct contact with the coolant.

Some cars are equipped with two sensors, one of which is located at the outlet of the radiator; the second is located at the outlet of the engine. They can be either negative or positive temperature coefficient. In modern cars, the first type of signaling devices is mainly used.