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Old 03-17-2017, 04:09 PM
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Low Coolant Sensor Question

A friend of ours has a late model E class wagon...I think it may be 2011. She texted me about getting a low coolant message. Since she was in the area I told her to stop by so I could take a look.

The reservoir seemed fairly full. But when I removed the cap I noticed that the level was just below the top of the two electrical prongs in the reservoir. Am I correct to assume that coolant needs to cover completely those two prongs in order for the sensor not to be tripped?

Thanks.
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Old 03-18-2017, 05:40 AM
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shertex, on the typical coolant expansion tank there is a "full" line. With a cold engine the coolant should be at that level.
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Old 03-18-2017, 06:46 AM
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Quote:
Originally Posted by Ferdman View Post
shertex, on the typical coolant expansion tank there is a "full" line. With a cold engine the coolant should be at that level.
Yes, I know. I'm asking about the sensor. I only had the opportunity to look at the coolant level when it was hot.
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06 E320 CDI "Benson", Platinum Blue, 175k mi
06 E320 CDI "Rutherford", Black, 145k mi
91 300D "Otis", Smoke Silver, 129k mi
98 E300 "Murray", Silver, 128k mi, Stage 2 Rocketchip chip tuned, under son's care, getting EXPENSIVE!

Twelve other MB's owned and sold
2002 Honda Odyssey 254k mi (want to name it "Homer," wife won't let me)
1961 Very Tolerant Wife
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  #4  
Old 03-18-2017, 08:42 AM
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shertex, I am unfamiliar with the specifics of any MB vehicles after 1998. Our older E-Class vehicles have a float switch in the coolant expansion tank that initiates a warning light for low coolant level. Based on your description, I would think the coolant level needs to be above the electrical prongs to avoid the "low coolant" warning message.
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