Cooling fan continuously running at high speed?

Tiny
LEAHD54321
  • MEMBER
  • 2011 MERCEDES BENZ S550
  • 5.5L
  • V8
  • AUTOMATIC
  • 130,000 MILES
Fan continuously running at high speed and takes a significant amount of time to turn off after the car is off. Ruined my battery
Friday, April 11th, 2025 AT 8:15 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,144 POSTS
Yes, this happens when the fan control module goes out or the engine coolant sensor goes out.do you have a check engine light on? If not, here is the location so you can change the control module out to fix the problem. You might want to do a CAN scan to help confirm the failure.

https://youtu.be/u-4syLc-ifQ

Check out the images (below). Let us know how it goes.

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Sunday, April 13th, 2025 AT 11:10 AM

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