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The coolant temperature sensor is an element of the engine cooling system that is responsible for turning on the radiator fan. It is often installed in the radiator itself, and sometimes on the cooling system housing.

Signs of sensor malfunction

  • Poor engine starting in cold weather
  • Poor engine starting when hot
  • Increased fuel consumption
  • Black smoke comes out of the muffler
  • Problems in the operation of the engine cooling system fan 
  • Random activation of the cooling fan.

The reasons for sensor failure may be:

  • Damage to the housing.
  • Oxidation of contacts.
  • Damaged contact chip
  • Wire insulation damage.

At the slightest suspicion of these signs, it is necessary to diagnose the sensor and, if necessary, install a new one.

To check the sensor, it is best to contact a service station.

The part cannot be repaired. As a rule, a breakdown can be diagnosed by the fact that when the motor heats up excessively, the fan does not activate, providing airflow and intensive cooling.

Replacement of the sensor should only be done on a cold engine. Before removing the sensor, it is necessary to drain the coolant, which is unsafe to do on a hot engine.

After completing the replacement process, you should check the operation of the new coolant temperature sensor. To do this, it is recommended to start the engine and check the dashboard readings. If necessary, you need to contact a specialist again for additional diagnostics.


"Coolant temperature sensor replacement" fixes "Faulty coolant temperature sensor"

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Four common causes for an “engine temperature” light on the vehicle and their related parts.
This fix will help eliminating

Engine Temperature Light

The engine temperature warning light basically says, “We’re overheating.” Commonly, the car might be running low on coolant. But it can also be an airflow clog-up, broken fans, or leaks.

Are you noticing the engine temperature warning light on your dashboard? This light is an essential indicator of something wrong with your vehicle. But don't worry; paying attention to your car's behavior and understanding how to communicate it with your local auto shop helps you assess the problem before it worsens.

In this article, we're going to focus on common causes of the engine temperature warning light. We'll also give you tips on communicating with a mechanic in case you seek professional assistance. So don't wait; read on and better understand your car's needs.

Learn More about the Symptom

Other Vehicle Symptoms

Below are just a few examples of typical Symptoms and Fixes your car might be experiencing

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