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Pelican Technical Article:
Coolant Temperature Sensor Replacement

Tom Morr

 
Time: 1 hour
Tab: $12
Talent:  
Tools:
19mm wrench
Applicable Models:
SLK 230 R170 (1996-04)
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
 
   

   
Check out some other sample projects from the book: 
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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.
Large Image | Extra-Large Image
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).
Large Image | Extra-Large Image
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).
Large Image | Extra-Large Image
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).
Large Image | Extra-Large Image
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.
Large Image | Extra-Large Image
Need to buy parts for this project?
Click here to order parts for your Mercedes-Benz from our parts catalog
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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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  Applies to: SLK 230 R170 (1996-04)
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