E-Class (W212) 2010 - 2016: E 350, E 550

Coolant temperature gauge fluctuating

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Old 04-26-2017, 07:57 AM
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MB E550 2010
Coolant temperature gauge fluctuating

Hello everyone. I just noticed for a couple of days now that coolant temperature gauge is fluctuating between 80c and around 82c. When driving for some time I can see the temperature reaching the 82 mark, but coming off the highway for example, the temperature drops to 80. Is that normal? I did not notice that while owning the car for 4 years now, only after oil change done last Friday. Appreciate your inputs. Thanks
Old 04-26-2017, 08:01 AM
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Sounds normal. When the stat fails it will go wide open and the temp will not be able to climb to 80c. Keep an eye on it.
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