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I get e "top off coolant" message. but it is full and temp…

i get e "top off...
i get e "top off coolant" message. but it is full and temp is good. how do I reset message
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9/26/2017
Lou P. master tech
Lou P. master tech, Mercedes Technician
Category: Mercedes
Satisfied Customers: 6,260
Experience: 20 years Master Certified excellent fix rate and have access to factory wiring, and instructions.
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Hello, my name is***** and i will do my best to assist you.I am going over your story now and will reply back soon with some info,thanks!

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The message will reset on its own . If the coolant is full then you have 1 of 2 issues the sensor in the reservoir is stuck or the cooling fan is bad . You will get the same message if the cooling fan is not operating correctly . Turn the ac on max and run the engine and see if the fan works for the radiator . Hope this helps . Please take a second and click the stars at the top of the screen to rate my service so I may receive my credit for helping, 5 STARS is ideal. Please request me in the future! Keep in mind that when you rate it does NOT end our conversation, you can still return here to me for follow up information if needed just simply reply back, THANKS! Lou P Master Mercedes-Benz Tech Master ASE Certified

Lou P. master tech
Lou P. master tech, Mercedes Technician
Category: Mercedes
Satisfied Customers: 6,260
Experience: 20 years Master Certified excellent fix rate and have access to factory wiring, and instructions.
Verified
Lou P. master tech and 87 other Mercedes Specialists are ready to help you
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Customer reply replied 10 months ago
Hi Louthe cooling fan works well, the coolant level is fine, the cars temp is good (at normal).
so it must be the sensor. can you give me location and how to change it out.
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