S-Class (W222) 2014-2020

S550 - 2014 Engine fan runs high

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Old 08-07-2024, 02:36 PM
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S550 - 2014 Engine fan runs high

Hi all,
I own a 2014 S550 with 90,000 miles.
The engine fan runs full speed as long as the car is running, even without AC on. Additionally, the fan starts at full speed in the early morning when I just open the door.
When I turn the engine off, the fan runs for 10-15 seconds every 5-10 minutes until it stops about an hour later.
Where should look for the problem? I don't think this is normal.
I posted loss of coolant in
Losing coolant - S550 2014 - MBWorld.org Forums but not sure if they are related.
Thanks for any help.
Old 08-07-2024, 05:45 PM
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2016 S550
Could be a bad fan relay or temp sensor.

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