How does the coolant temperature sensor work?

The coolant temperature sensor isa mechanism that is created to make the DC voltage from the temperature of this liquid. Thanks to its information, it is possible to correct the main parameters that control the engine, depending on what its thermal state is.

The gauge of temperature of a cooling liquidThe coolant temperature sensor isThe unit is powered by a working current that comes from a stabilized source of the control unit. Its output voltage can be adjusted. This depends on the temperature of the external environment. This is how the temperature sensor operates. If it increases, the output voltage of the sensor becomes larger.

It is worth to tell how the sensor is designedcoolant temperature. It consists of a metal casing that has a cylindrical head-piece. Inside it is a sensing element. Also in its complete set includes a tail plastic part with a two-pin plug.

How to install and install such a thing asa coolant sensor? This mechanism is installed on the engine, usually on the body of the block cylinder thermostat of the engine. And the air temperature sensor is placed on the receiver of the engine intake pipe. This mechanism is screwed into the threaded mounting hole, after which, by means of a sealant, the joint is sealed. The sensor is connected to the wiring harness by means of a two-pin socket with a latch. I would like to note that these mechanisms are polar according to the scheme of connection, that is, the breakage state is equivalent to the reverse inclusion of the sensor.

The gauge of a cooling liquidThere are several types of this mechanism. The most common type is a sensor of a cooling liquid - a thermistor. The resistance of such a mechanism changes if the temperature of the liquid also undergoes changes. Most often these are thermistors having a negative temperature coefficient. In them, the resistance decreases with increasing temperature and, conversely, becomes larger if the engine is cold. When it warms up - the resistance drops, when its temperature reaches a minimum - work commences.

Not every engine coolant temperature sensorhas one function. Sometimes mechanisms with a dual function are used. That is, when the temperature reaches a certain level, the electronic control unit changes the voltage value so that the readings acquire a higher resolution.

Operating principle of the temperature sensorOn older models of cars, otheraggregates. Basically they have a switch with two positions. These sensors can only be opened or closed at a specific temperature. In addition, they have a direct connection to the relay in order to be able to turn off and turn on the cooling fan. Or he sends a signal to the dashboard, and then the lamp begins to light, indicating that the signal is received. Similar sensors (which are single-wire) send a signal to the measuring device that is on the instrument panel.

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