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. POLO (6N1)
2. A4 (8D2, B5)
3. A4 Saloon (8D2, B5)
4. A4 / S4 (8D2, B5)
5. SHARAN (7M8, 7M9, 7M6)
6. POLO CLASSIC (6V2)
7. FLIGHT CLASSIC (6V2)
8. DERBY CLASSIC (6V2)
9. CADDY II Box Body/MPV (9K9A)
10. VAN II Box Body/MPV (9K9A)
11. PANEL II Box Body/MPV (9K9A)
12. CADDY Mk II (9K9A)
13. INCA (6K9)
14. POLO Variant (6V5)
15. POLO Estate (6V5)
16. POLO Van Hatchback Van (6N1)
17. POLO (6N2)
18. CADDY II MPV (9K9B)
19. CADDY II VAN (9K9B)
20. CADDY II Estate (9K9B)
21. See more in applications

The coolant temperature sensor construction

The DELPHI 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.