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Pelican Technical Article:

Coolant Temperature Sensor Replacement

Tom Morr

Time:

1 hour1 hr

Tab:

$12

Talent:

*

Tools:

19mm wrench

Applicable Models:

Mercedes-Benz SLK230 (1998-04)

Parts Required:

New coolant temperature sensor

Hot Tip:

Don't work on a hot engine

Performance Gain:

Piece of mind on engine temperature

Complementary Modification:

New hoses

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Replacing the coolant temperature sensor on your SLK230 is a relatively easy job and can be accomplished in under an hour. Make sure that the car is not running, you are working on a cool engine and that the coolant system is not under pressure.

Remove the front engine cover. It just pulls straight up.

With the cover off you can see the thermostat housing assembly. The coolant runs from the engine block past the temperature sensor and to the thermostat and then the water pump.

Squeeze the connector on the top together and pull it out of the sensor.

Use a 19mm wrench and remove the sensor from the thermostat housing assembly.

You can use the probe part of the sensor to get an idea of the shape of your cooling system and coolant. This one is not too bad but I would recommend a coolant flush.

Installation is the reverse of removal.

Remove the front engine cover (yellow arrow).
Figure 1

Remove the front engine cover (yellow arrow). It just pulls straight up.

With the cover off you can see the thermostat housing assembly.
Figure 2

With the cover off you can see the thermostat housing assembly. The coolant runs from the engine block (blue arrow) past the temperature sensor (red arrow) and to the thermostat (yellow arrow) and then the water pump (green arrow).

Squeeze the connector (yellow arrow) on the top together and pull it out of the sensor housing (yellow arrow).
Figure 3

Squeeze the connector (yellow arrow) on the top together and pull it out of the sensor housing (yellow arrow).

Use a 19mm wrench and remove the sensor from the thermostat housing assembly (red arrow).
Figure 4

Use a 19mm wrench and remove the sensor from the thermostat housing assembly (red arrow).

You can use the probe end of the sensor (yellow arrow) to get an idea of the shape of your cooling system and coolant.
Figure 5

You can use the probe end of the sensor (yellow arrow) to get an idea of the shape of your cooling system and coolant. This one is not too bad but I would recommend a coolant flush.

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Comments and Suggestions:
ironwill Comments: 1999 slk230 kompressor, middle console and glove compartment, panel that covers the front instrument panel and connects to the middle console, hydraulic shock that makes trunk raise out for top to go down in. The one we have is leaking or do you have a replacement seal kit?
June 18, 2014
  Followup from the Pelican Staff: Give our parts specialists a call at 1-888-280-7799 and they can help figure out which part or repair kit you need.
- Nick at Pelican Parts
 

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Page last updated: Fri 9/19/2014 01:26:17 AM