Genuine Volvo 940 Coolant Temperature Sensor

The Coolant Temperature Sensor in a Volvo 940 helps the electronic control module operate the powertrain efficiently by checking the heat level of the engine coolant. The device is directly threaded into a coolant passage to have constant contact with the circulating coolant to give immediate temperature feedback. It acts as a negative temperature coefficient thermistor, as its electrical resistance drops with coolant increase. The control module of the Volvo gives a constant five-volt reference and reads the lowered return voltage for precise calculation. Using this input, it gives a longer fuel injector pulse width for a richer cold start and a leaner warm operation, increasing the idle speed as necessary to prevent stalling, and switching the electric cooling fan on or off to stabilize engine heat. The temperature data also allows for functions that should not occur until normal operating temperature is reached. These functions include exhaust gas recirculation, evaporative emissions purge, and torque converter clutch engagement. Simultaneously, it can drive a dashboard gauge that tells the driver what is happening in the engine. The threaded body of the sensor seals positively to ensure no leaks while bringing the tip of the thermistor as close to the coolant stream as possible to ensure minimum lag and maximum accuracy. Since only a low current signal is supplied by the Coolant Temperature Sensor, high-current devices like the radiator fan are switched on through relays to prevent overloading of the primary electrical supply. The owners of the Volvo 940 make use of this exact thermal feedback. Furthermore, the solid-state design of the Coolant Temperature Sensor ensures consistent operation over a variety of driving conditions. It is a case of Volvo engine management.

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