CLK-Class (W209) 2003 on: CLK 270 CDI, CLK 200K, CLK 200 CGI, CLK 240, CLK 320, CLK 350, CLK 500, CLK 550 [Coupes & Cabriolets]

Cooling system issues!

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Old Nov 21, 2018 | 02:43 AM
  #1  
rennwerkes's Avatar
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From: Honolulu, Hawaii
2001 E55, 2002 ML55, 2002 SL500, 2003 CLK55
Cooling system issues!

Hoping I can get some advice/insight into my problems.
Noticed that my radiator was a Valeo so changed it out with a Behr unit.
Also changed out the temperature sensor for good measure.
Prior to all the work my instrument cluster was showing no faults and temperature sensor was reading correctly.
Start the car up and ran it for a while. Just FYI, car is still up on jack stands.
No temperature reading. Also showing a bad coolant level sensor.
Also, fan comes on shortly after start up and runs full blast. But takes a few minutes.
I also changed out the thermostat, but can't imagine that would contribute to any of the problems.
Any ideas what's going on? Car has about $100k on it.
Because the sensors are so cheap, I might just change out the temperature sensor and coolant level sensor.
Thanks
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Old Nov 25, 2018 | 03:25 PM
  #2  
rennwerkes's Avatar
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From: Honolulu, Hawaii
2001 E55, 2002 ML55, 2002 SL500, 2003 CLK55
No one encountered any of these problems?
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Old Nov 25, 2018 | 08:36 PM
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I suspect a bad temp sensor or damaged wiring for it.
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Old Nov 25, 2018 | 08:44 PM
  #4  
rennwerkes's Avatar
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2001 E55, 2002 ML55, 2002 SL500, 2003 CLK55
Rodney,
Thanks for the reply.
Is there a typical failure point in the wiring?
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Old Nov 25, 2018 | 09:42 PM
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Not really, other than the connector itself.
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Old Nov 25, 2018 | 11:41 PM
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Got it. Thanks
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Old Jan 21, 2024 | 04:09 PM
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2002 clk 430
I just had this problem in my 2005 CLK500. Thank you all for your help on this post!

I had to cut out the old elbow on the engine side and I ordered both pieces from Mercedes.

I will post here if I have any questions once I start installing the new parts.

Mike
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