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2011 SLK250
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602 Posts
Discussion Starter · #1 ·
I have just discovered this component, which seems to be a temperature sensor or something...

It's not the outside temperature, because that is in it's place, in the front bumper.

I checked what the coolant temperature looks like, and it's not like this.

So what is it...?

It was placed somewhere on the left side (as you sit in the car), near the headlight.
The wires seem to come together with the headlight wires (they are not connected).

It was superficially duct taped somewhere around the headlight, and it came off, so I noticed it, but can't tell what is it, or where it should belong...

I apologize for not being able to provide better photos, my camera is bad.
 

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*Premium Member
2011 SLK250
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602 Posts
Discussion Starter · #3 ·
Nono, the white isulation band is what I added myself today, to prevent it from touching other components.

It has the Mercedes logo on it, and has a jack, can be removed from the cable.
 

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2011 SLK250
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602 Posts
Discussion Starter · #5 ·
Thanks for your reply.

I come with some updates:
- The numbers are the following: 012 545 04 28, which is an electrical pin bushing housing.
- The component was really stuck, so didn't manage to remove it yesterday, but today I forced it out (nothing broke)
- There are only 3 numbers on the component itself: 347
- Now that I removed, I get two warnings on my instrument cluster, when I turn the key to position 2: Low coolant and Low windshield water, which is strange, because how can this measure the level of coolant and water, if it has no contact with either...

I also managed to get some better quality photos
 

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Founding Member 2006
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108,893 Posts

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*Premium Member
2011 SLK250
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602 Posts
Discussion Starter · #8 ·
Yep, found where it comes from, as well.

The part that broke is so well stuck in the coolant reservoir, that no water comes out at all, can't even move it.
Gonna have to disassemble the whole reservoir, and replace it like that.

The previous owner duct taped it back, and left it there...

Wonder how this works, because in my opinion, if it's like this, there should be a light on the instrument cluster, but there is nothing...
So by replacing it, will the low coolant level be properly signaled...?
 

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*Premium Member
2011 SLK250
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602 Posts
Discussion Starter · #9 ·
So I just discovered how awesomely this system works!

Basically, it actuates in the presence of a magnet.
In the reservoir, there is a floating magnet, which when too low, gets close to the sensor, it activates it, and lets the current pass, which turns on the light.


For more details, and pictures, you can also check out this thread:
Permanent Check Coolant Level message? - Xoutpost.com

Glad this thing is broken, learned a new awesome thing today!
 

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Founding Member 2006
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108,893 Posts
yup. was in that list of posts/threads i posted.
 
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