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Mercedes Coolant Level Sensor Replacement
 
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Pelican Technical Article:

Mercedes Coolant Level Sensor Replacement

Steve Vernon

Time:

15 minutes15 mins

Tab:

$10

Talent:

*

Tools:

Hands

Applicable Models:

Mercedes-Benz C320 (2001-04)
Mercedes-Benz CLK320 (1998-04)
Mercedes-Benz E320 (1998-04)
Mercedes-Benz ML320 (1998-03)
Mercedes-Benz S320 (1998-99)
Mercedes-Benz SLK320 (2001-03)

Parts Required:

New coolant level sensor

Hot Tip:

Replace the sensor with the engine cold

Performance Gain:

Knowing the temp of your engine

Complementary Modification:

Flush cooling system

If you are having problems with your coolant level sensor, do not worry as it may be one of the easiest and fastest repairs you can make on your Mercedes-Benz W203.

The coolant tank is located in the engine bay on the right side. The sensor is located on the lower portion of the front of the tank, right below the auxiliary coolant pump. The nice thing about replacing this sensor is that you do not need to drain the coolant from the tank to perform this job as the coolant does not actually make direct contact with the sensor. I would recommend letting the car cool for a little bit before doing as it is a tight fit in there and you don't have to work around a hot tank and hoses.

Begin by removing the right side air intake duct. Simply compress it back towards the engine and slip it off the front air inlet.

With the duct off you can access the coolant level sensor on the lower part of the tank better.

Remove the wiring harness by pulling it straight back.

Turn the sensor 45 degree clock wise.

Pull the sensor from the bottom of the tank.

Installation is the reverse of removal.

Begin by removing the right side air intake duct.
Figure 1

Begin by removing the right side air intake duct. Simply compress it back towards the engine (red arrow) and slip it off the front air inlet.

With the duct off you can access the coolant level sensor on the lower part of the tank better (red arrow).
Figure 2

With the duct off you can access the coolant level sensor on the lower part of the tank better (red arrow).

Remove the wiring harness by pulling it straight back (red arrow).
Figure 3

Remove the wiring harness by pulling it straight back (red arrow).

Turn the sensor 45 degree clock wise.
Figure 4

Turn the sensor 45 degree clock wise.

Pull the sensor from the bottom of the tank (red arrow).
Figure 5

Pull the sensor from the bottom of the tank (red arrow).

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Comments and Suggestions:
Danny Comments: My radiator fan doesn'turn the water coolant light blitz
September 13, 2015
  Followup from the Pelican Staff: Check power and ground to the fan when the engine is hot if none, check the coolant sensor. - Nick at Pelican Parts  
kaz Comments: I had the coolant tank with sensor changed twice and the light still comes on
what do I do now?? On a ML320 2002
September 12, 2015
  Followup from the Pelican Staff: Check the wiring. It may be faulty. - Nick at Pelican Parts  
Mark Comments: Wayne, after purchasing the sensor from Pelican, I followed your instructions to the tee. Worked and was easy as you said. Only problem is the Warning Light is still on. Checked the fluid level and everything looked good. What now?
April 18, 2014
  Followup from the Pelican Staff: Could be a wiring issue from the sensor to the ECU. - Nick at Pelican Parts  
Bill Comments: I have 2003 mercedes benz c230 change lavel sensor and bottle till have problem w/ lavel sensor
March 27, 2014
  Followup from the Pelican Staff: I would inspect the wiring for the sensor. - Nick at Pelican Parts  
Alex Comments: I am experiencing exactly the same 2004 C230 Sport as Qainat. there is no way it can be removed at 45 deg.
btw,where I can find the washer fluid level sensor?

Alex
January 29, 2014
  Followup from the Pelican Staff: The sensor should rotate 45°, it can feel locked in place at times. Give our parts specialists a call at 1-888-280-7799. They can help you find the right part.
- Nick at Pelican Parts
 
Qainat Comments: The sensor would not come out with a 45 degree twist. It clicked all the way to 90 degrees, where it make out a little way but still remained stuck.
January 16, 2014
  Followup from the Pelican Staff: Are you still having trouble removing it? Try wiggling between 20° and 45°. - Nick at Pelican Parts  

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