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Coolant level sensor replacement

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  • OVERALL DIFFICULTY INDEX: 2/10
  • NO TOOLS NEEDED FOR THIS JOB
  • IF YOU HAVE NO EXPERIENCE YOU SPEND 20 MINUTES TO CARRY OUT THIS JOB
  • RISK OF BURNS, SEE BELOW​

BEFORE YOU START
  • Be careful not to touch any hot part of the engine.
  • When topping up the coolant level, never add water alone, always use a ready-made coolant or mix a concentrate with distilled water.
DISCLAIMER:
Our pictorials are of informative nature and do illustrate works carried out by ourselves at our own premises for our own use and satisfaction.
Readers who envisage to carry out similar works inspired by the below method shall do this at their own risks and liability.

Context and symptoms of a worn coolant switch (sensor)

  1. Coolant level light (alarm) goes on while driving.
  2. Coolant level light goes on even when coolant level is between the Min/Max marks when engine is cold.
  3. The sensor electrodes show advanced signs of abrasion (above image)

Coolant level sensor location

The coolant level sensor is fixed to the radiator tank where you refill your car with coolant.
It can have many shapes but modern electronic units look like a rectangular box.
Start by disconnecting the electrical connector (right).

Removal / refitting of the coolant level sensor

  • You can only work on a cold engine
  • Just tilt the coolant sensor by hand 90 degrees anticlockwise (left) to take it out (middle).
  • Push the new level sensor in (right) then tilt it again 90 degrees clockwise to fix it and plug the electrical connector in.
That's it!
Do not forget to mix and add coolant until the level is between the Min and Max marks.
Use a concentrate that you dilute with distilled water (not tap water) or a ready-to-use coolant.

Buy your coolant level sensor and coolant liquid from our partners' stores:

See also...