Strange fan/ coolant issue
Thread Starter
Junior Member
Joined: Jan 2022
Posts: 46
Likes: 1
From: Orlando, Fl
2017 GLS 450
Strange fan/ coolant issue
Hi all,
I have a 2015 E63S Wagon and something quite funky is going on. There is a yellow coolant light on the dash periodically but the temperature stays between 190 and 195 and the coolant level is correct. Today I have noticed the fan keeps turning on periodically even though I haven't driven the car for 7 or 8 hours. Does anyone know what this could possibly be? I am not even sure where to start looking in these forums. Thank you in advance for any insight.
I have a 2015 E63S Wagon and something quite funky is going on. There is a yellow coolant light on the dash periodically but the temperature stays between 190 and 195 and the coolant level is correct. Today I have noticed the fan keeps turning on periodically even though I haven't driven the car for 7 or 8 hours. Does anyone know what this could possibly be? I am not even sure where to start looking in these forums. Thank you in advance for any insight.
Last edited by ph2426; Dec 8, 2022 at 08:41 AM.
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Joined: Jun 2021
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From: Fleriduh
W212 E63S Wagon - GSL580 - E63 - E350 - C300
I had the same thing (only I have a much larger E63 as opposed to your tiny, pathetic E62 ;-)
After I replaced my coolant tank the issue went away...then, well, my other issues that I had just posted about.
After I replaced my coolant tank the issue went away...then, well, my other issues that I had just posted about.
Thread Starter
Junior Member
Joined: Jan 2022
Posts: 46
Likes: 1
From: Orlando, Fl
2017 GLS 450
Thread Starter
Junior Member
Joined: Jan 2022
Posts: 46
Likes: 1
From: Orlando, Fl
2017 GLS 450
Thank you all. I actually just changed the expansion tank myself a few weeks ago and the coolant level looks ok. Could it be the plug that goes into the tank at the bottom? Would that cause the yellow warning and the fan running?
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Thread Starter
Junior Member
Joined: Jan 2022
Posts: 46
Likes: 1
From: Orlando, Fl
2017 GLS 450
I unlocked my car this morning and it had been sitting all night and the fan started running immediately and also ran about 5 minutes after. I have not turned the car on yet. Has anyone seen this?
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Out Of Control!!
Joined: Jun 2004
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2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
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Joined: Jun 2021
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From: Fleriduh
W212 E63S Wagon - GSL580 - E63 - E350 - C300
Yes, in a car with a bad thermostat or bad sensor. It already thought it was hot....while your car is a bit heavy, it takes a special kinda fat pig to think it is hot before it is even started ;-P
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Joined: Feb 2017
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From: Baltimore County, MD
'13 s212 63 p30. '06 LX470
definitely get the codes read before any work. Thermostat is diy, but not fast.
