Fluctuating Engine Temperature

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E200MB

New Member
Joined
Jul 23, 2020
Messages
1
Location
London
Car
E200 2018
Hi,
I have a E200 2018 Mercedes with a fluctuating temperature gauge. When at full temperature it fluctuates between 80-90. It can drop back to 80 for a second or a minute while driving at steady speed on motorway. Also during a cold start it goes up and down several times on the way up to 90. I noticed this occurring for a few days before the check engine light came on. The Mercedes Dealer replaced the cooling sensor (at a cost of nearly 1000 euros) but now it is still occurring. Does anyone know the solution as the dealer me told me this is normal. Any advice would be greatly appreciated as will be talking to the garage again tomorrow.
 

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