Coolant Temperature Sensor location
Thread Starter
Newbie
Joined: Sep 2019
Posts: 3
Likes: 0
2009 ML350
Coolant Temperature Sensor location
Engine Compartment
Where is the Coolant Temperature Sensor on my 2009 ML 350? Please attach any link(video or otherwise) that may help in its replacement. I am a DIYer.
Thread Starter
Newbie
Joined: Sep 2019
Posts: 3
Likes: 0
2009 ML350
Found it, removed it, and replaced it. However, after install with new o-ring, part does not seem to fit as snug as the part I removed. Part numbers match(though it is aftermarket), and it also passed the eye test. Kind of afraid to top of fluid and start up. Don't want to cause another issue. Any insights?
Trending Topics
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
Junior Member
Joined: May 2018
Posts: 33
Likes: 0
2012 GL350 Bluetec
Hey Maj. Dundee can you help me i am looking for a coolant temperature sensor for a 2012 Mercedes Benz GL350 Bluetec. Also the circuit diagram for the radiator fan module to the ECM. As my car is overheating and the cooling fan doe snot move.
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
The following diagram is for W164 CDI as I cannot gain access to X166 diagram, but it should be the same. Do not apply voltage to any line as you may toast the ECM.
Check fuse #7 100 amp at the Front Pre-Fuse Box for the fan M4/7, to see if it is blown.
Here is the diagram and legend.
Check fuse #7 100 amp at the Front Pre-Fuse Box for the fan M4/7, to see if it is blown.
Here is the diagram and legend.
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
Junior Member
Joined: May 2018
Posts: 33
Likes: 0
2012 GL350 Bluetec
Sorry to bother you, but can you show me in a picture where this fuse is located that is outlined below sir
Check fuse #7 100 amp at the Front Pre-Fuse Box for the fan M4/7, to see if it is blown.
Check fuse #7 100 amp at the Front Pre-Fuse Box for the fan M4/7, to see if it is blown.
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
There are probably two fuse boxes under the hood, one large and one small (Pre-Fuse Box).
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
Junior Member
Joined: May 2018
Posts: 33
Likes: 0
2012 GL350 Bluetec
We took the radiator fan out and noticed that the outer bearing is broken and it would not move, we have removed the bearing and it moves freely. Now i just have to figure out what type of bearing this is an di might be good a few hundred dollars if i do not have to get the whole fan unit.
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
We took the radiator fan out and noticed that the outer bearing is broken and it would not move, we have removed the bearing and it moves freely. Now i just have to figure out what type of bearing this is an di might be good a few hundred dollars if i do not have to get the whole fan unit.
If you get a used one or buy an aftermarket one, you might have the same prob. in 6 months. Choose wisely.
Newbie
Joined: Jul 2021
Posts: 9
Likes: 0
From: Bronx
ML350 2010 bluetec
Hi Maj,
I have a ML 350 Bluetec of 2010, and on idle very ofter the RPM's stays at 800, but usually it should be at 700 RPM. I dont get any code at all and very difficult to know whats going on. Have you seen something similar from your experience? Could the coolant temp sensor intermittent signal cause that?
I have a ML 350 Bluetec of 2010, and on idle very ofter the RPM's stays at 800, but usually it should be at 700 RPM. I dont get any code at all and very difficult to know whats going on. Have you seen something similar from your experience? Could the coolant temp sensor intermittent signal cause that?
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
Hi Maj,
I have a ML 350 Bluetec of 2010, and on idle very ofter the RPM's stays at 800, but usually it should be at 700 RPM. I dont get any code at all and very difficult to know whats going on. Have you seen something similar from your experience? Could the coolant temp sensor intermittent signal cause that?
I have a ML 350 Bluetec of 2010, and on idle very ofter the RPM's stays at 800, but usually it should be at 700 RPM. I dont get any code at all and very difficult to know whats going on. Have you seen something similar from your experience? Could the coolant temp sensor intermittent signal cause that?
Look at the PDF and see all the possibilities that could be the cause
