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Old 06-26-2001, 10:05 AM
wjm's Avatar
wjm wjm is offline
Join Date: Dec 2000
Location: Suburban Detroit, MI
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I was testing out my aux fans the other day. I noticed that the sensor that it plugs into (Coolant Temperature Sensor) was turning. That is, although it is not leaking, the green sensor portion spins within the brass casing. See

Is this normal? Should it be replaced?


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Old 06-28-2001, 05:06 PM
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wjm wjm is offline
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I decided to replace it anyway. Part# was 000 542 4517.

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Old 06-28-2001, 05:20 PM
David C Klasse's Avatar
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Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
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You say the sensor was turning...
What was the problem? Was there one? Was there an indication that there might have been a problem?
And what do you mean it was turning? Like spinning?
Anyway, glad your problem was solved!
And thanks for posting the results!
2006 E350 w/ 155k miles (Daily Driver)

1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
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1999 S420 (Mom's/Dad's)
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1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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Old 06-28-2001, 05:51 PM
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wjm wjm is offline
Join Date: Dec 2000
Location: Suburban Detroit, MI
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The sensor is pictured in the link above. I was told that because the blue piece (plastic/ceramic?) turned within the brass piece that this was not good.

Problem was that I was not sure that the fans were always engaging at the right time.

Although it might not have been defective, for $25 it was a no brainer to just change it for piece of mind.

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