C-Class (W204) 2008 - 2014: C180K, C200K, C230, C280, C300, C350, C200CDI, C220CDI, C320CDI

Radiator Cooling fan relay/sensor location?

Old Mar 10, 2012 | 08:53 PM
  #1  
tasho3's Avatar
Thread Starter
MBWorld Fanatic!
 
Joined: Jun 2007
Posts: 2,208
Likes: 22
From: Westmont, IL
2014 C63 Sedan
Radiator Cooling fan relay/sensor location?

The radiation cooling fan runs at full speed everytime I turn the car on and it's 40+ degrees outside, it only shuts off when I turn the engine off, can anybody point me where to locate the relay or temperature sensor for the fan?
Reply
Old Mar 11, 2012 | 12:05 AM
  #2  
RLE's Avatar
RLE
MBWorld Fanatic!
 
Joined: Feb 2004
Posts: 3,986
Likes: 6
From: SEATTLE WASHINGTON USA
'08 C300 Lux Barolo Red Beige Leather P2 MM 18" wheels '84 944
Originally Posted by tasho3
The radiation cooling fan runs at full speed everytime I turn the car on and it's 40+ degrees outside, it only shuts off when I turn the engine off, can anybody point me where to locate the relay or temperature sensor for the fan?
It's not that simple. The electric fan runs at varying speeds in response to the various cooling loads, whether the AC running on a hot day, what the engine temp is at that moment and so on. Likely there is a stored code if there is a true malfunction.
Reply
Old Mar 11, 2012 | 11:06 AM
  #3  
tasho3's Avatar
Thread Starter
MBWorld Fanatic!
 
Joined: Jun 2007
Posts: 2,208
Likes: 22
From: Westmont, IL
2014 C63 Sedan
Originally Posted by RLE
It's not that simple. The electric fan runs at varying speeds in response to the various cooling loads, whether the AC running on a hot day, what the engine temp is at that moment and so on. Likely there is a stored code if there is a true malfunction.
I understand that, but it does not display and messages on the dash
Reply
Old Mar 12, 2012 | 06:08 AM
  #4  
billvip's Avatar
Junior Member
 
Joined: Aug 2009
Posts: 67
Likes: 0
From: Seattle, WA
2018-G550
i accidentally plugged the "block heater"(you know what i mean if you in Canada) in 11c degree spring, the water temp shows 90. everything works fine. just the front fan keeps running at full speed all the time.(really noisy!)
even when i shut down the engine it will goes on for like 30 sec....so im sure it's not in the water cooling sys since its 90 degree which is normal engine temp...
Reply
Old Mar 12, 2012 | 09:25 AM
  #5  
tasho3's Avatar
Thread Starter
MBWorld Fanatic!
 
Joined: Jun 2007
Posts: 2,208
Likes: 22
From: Westmont, IL
2014 C63 Sedan
Originally Posted by billvip
i accidentally plugged the "block heater"(you know what i mean if you in Canada) in 11c degree spring, the water temp shows 90. everything works fine. just the front fan keeps running at full speed all the time.(really noisy!)
even when i shut down the engine it will goes on for like 30 sec....so im sure it's not in the water cooling sys since its 90 degree which is normal engine temp...
yep thats what mine does, when its under 40 ferenheit degrees out, it does not go on at all!
Reply

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

Thread Tools
Search this Thread
Rate This Thread
Rate This Thread:
You have already rated this thread Rating: Thread Rating: 0 votes,  average.


All times are GMT -4. The time now is 04:05 PM.

story-0
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

Slideshow: Not every Mercedes design becomes timeless, some feel stuck in the era they came from.

By Verdad Gallardo | 2026-05-12 18:09:07


VIEW MORE
story-1
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

Slideshow: Yes, Mercedes built manual cars, and some of them are far more interesting than you'd expect.

By Verdad Gallardo | 2026-05-02 12:36:58


VIEW MORE
story-2
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.

By Verdad Gallardo | 2026-04-29 11:19:28


VIEW MORE
story-3
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

Slideshow: Before curves took over, Mercedes mastered the art of the straight line, and some of those shapes still look right today.

By Verdad Gallardo | 2026-04-25 12:05:49


VIEW MORE
story-4
Flawlessly Restored Mercedes 190E Evo II Heads to Auction

Slideshow: The 190E Evolution II shows how a homologation necessity became a six-figure collector icon.

By Verdad Gallardo | 2026-04-22 17:53:47


VIEW MORE
story-5
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know

Slideshow: Mercedes is turning one of its core nameplates electric, and the details show just how serious this shift is.

By Verdad Gallardo | 2026-04-21 13:58:06


VIEW MORE
story-6
Mercedes EQS Gets A Major Update: Everything You Need to Know

Slideshow: Faster charging, longer range, and a controversial steer-by-wire system define the latest evolution of Mercedes-Benz EQS.

By Verdad Gallardo | 2026-04-15 10:35:34


VIEW MORE
story-7
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

Slideshow: These overlooked Mercedes-Benz models never got the spotlight, but they quietly delivered more than most remember.

By Verdad Gallardo | 2026-04-13 19:35:45


VIEW MORE
story-8
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

Slideshow: A well-used 1991 Mercedes-Benz 300D with more than one million miles is now looking for a new owner, and it still appears ready for more.

By Verdad Gallardo | 2026-04-10 10:05:15


VIEW MORE
story-9
10 Most Reliable Mercedes-Benz Models You Can Buy Used

Slideshow: From bulletproof sedans to surprisingly tough SUVs, these Mercedes models proved that the three-pointed star can go the distance.

By Verdad Gallardo | 2026-04-08 09:55:49


VIEW MORE