CAR Coolant sensor

Coolant temperature sensor: common defects and their signs

  1. Mechanical damages.
    • Increased fuel consumption.
    • The engine works irregularly or stalls at idle run.
    • Incorrect work of the cooling fan.
    • Antifreeze leaks are notable in the component area.
    • The cooling fluid level in the system lowered.
  2. Damaged wiring.
    • The temperature indicator doesn’t change its position or shows obviously incorrect readings.
    • The exhaust gases are dark-coloured.
    • Car handling worsened.
    • The engine takes long to warm up  or overheats quickly.

How to replace coolant temperature sensor?

If the component is out of order it should be replaced. It can be performed on your own. The process can differ for cars of different brands; generally you should perform the following actions to replace the sensor:

  1. Stop voltage supply to the battery.
  2. Drain coolant from the system if necessary.
  3. Locate the sensor; disconnect wires leading to it.
  4. Unscrew the sensor with the help of a wrench.
  5. Clean the surface and treat it with graphite grease.
  6. Install a new component.

Together with car sensor replacement it is recommended to replace its sealing, change coolant, and examine wires and contacts leading to it; clean them from oxides if necessary.

Coolant temperature sensor Information

Coolant sensor in the cooling system is serially connected with the temperature sensor. It is made of a material with a negative coefficient of resistance. When the temperature increases, sensor resistance decreases, the current in the circuit increases and the temperature point is more deflected and records a higher temperature (in the case of a diagram sensor mark on the diagram moves to larger values). To test the work of the sensor indicator disconnect the connector and strap the connector output when the ignition is on.

If the coolant sensor is faultless, its pointer should be deflected up to the maximum reading. To check the coolant sensor remove the dependence of the resistance of the sensor from the temperature. To do this, the coolant sensor should be removed. Then dip it into water and connect the ohmmeter between the sensor output and its case. Little by little warming the water, you should measure the resistance at different temperatures and compare the data with the parameters of this sensor, guaranteed by the manufacturer.

Different engines have different sensors with different temperature dependence of the resistance.

In diesel engines there are used two-element coolant sensors. One of the elements is used in the coolant sensor line. The second one is used in the control line of the candles preheating. Both elements are checked in the same way (ohmmeter is connected between the output of the corresponding element and the sensor body and not between the outputs of the sensor). But as a rule, there are different temperature dependences of resistance. Sensor data in catalogues and repair manuals are often given to a certain temperature. Thus, they specify the type of sensor and the value of its resistance to a single point.

If it is something wrong with your coolant sensor, you can visit our online shop. Here you will find all necessary parts at reasonable prices and fast delivery. In our online shop you will also find many other parts – gas spring, spark plugs, brake shoes and others.

Coolant temperature sensor: Bestsellers

-20%
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RIDEX Sensor, coolant temperature
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FEBI BILSTEIN Sensor, coolant temperature
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CALORSTAT by Vernet Sensor, coolant temperature
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