Persistant Coolant Light!! - Mercedes Benz SLK Forum

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#1 Old 05-02-2011
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Persistant Coolant Light!!

Hi All,
I've enjoyed the help of reading on this forum for a while now. This is my first post.

I have been having a problem with my Coolant Level light being illuminated for nearly a year now. I did run low on fluid at one point and after refilling, the dash warning did not go away. I thought I might have a bad sensor, so I replaced the coolant level sensor. That didn't fix it, so I tried filling up the washer fluid, and then replacing the washer level sensor. I considered that I might have the wrong fluid, so I bought mercedes fluid and did a coolant fluid drain and replace. None of these things have worked so far.

At this point I did a visual examination of the wires and fuses, which showed no obvious fault. I checked the plug for continuity, and it is indeed a closed circuit. The only thing I can think of is that the float is stuck in the down position. I can't seem to find a way to get at the float though. I loosened the tank and shook it around to no avail (a rubber mallet didnt help either).

When I unplug the coolant level sensor, the light remains illuminated and the washer level indicator does not illuminate.

Is there an easy way to un-stick the float, do I have to replace the coolant tank, or is there another common fault I can check for?

Thanks for the help! I'm excited to hopefully finally finish this fix.
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#2 Old 05-02-2011
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#3 Old 05-02-2011
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Check that the fan is plugged in and working, I had a tech leave off the fan connector and the coolant light came on.


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#4 Old 05-03-2011
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Actually, I had a separate problem during this period that led to me replacing the auxiliary (radiator) fan. It didn't seem to affect the light at all.
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#5 Old 05-03-2011
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Good luck, that's all I ran into when I was doing my S/C cooling pump.

Always good to see another SLK32 on the board. You'll find it's a great place for information.


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#6 Old 05-04-2011
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Thanks. Any other ideas what might be causing it, or what I could do to narrow it down?
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#7 Old 05-04-2011
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Quote:
Originally Posted by mistergoodpepper View Post
Thanks. Any other ideas what might be causing it, or what I could do to narrow it down?
Problem is they tied a few things to that light; fan, coolant level (I think they are in both the reservoir and the radiator), etc.. I've heard the washer fluid is tied to that light, but I have a washer fluid light.

I had the light come on a few times when my S/C cooling pump was out, but some of that was MB not plugging everything back in.

Has your S/C pump been replaced?

It might not be a sensor but a bad ground for a sensor. So might check the sensors for proper ground.

I'm surprised that one of the smarter R170 guys hasn't chipped in yet. Maybe post in one of the other forums.

I'll PM DaytonaJae I think he has schematics, you need a few more posts first.

320 Dreamer might have a clue as well.


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#8 Old 05-04-2011
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Quote:
Originally Posted by mistergoodpepper View Post
When I unplug the coolant level sensor, the light remains illuminated and the washer level indicator does not illuminate
Hi, sorry I have been otherwise occupied and haven't checked the forums in a few days...

What happens when you unplug the coolant level sensor and hotwire it so it completes the circuit with a paper clip or small strip of wire? Connect the two leads on the wire and see if the light goes away. This will tell you at least which half the problem is occurring at.

If it does go out when you jump it, then that will tell you that it is something in the tank. At that point, I would drain the coolant from the reservoir and take it out to inspect and see if you can fix the issue, perhaps replacing the tank all together will be in order.

I haven't actually had this problem you are describing. To my knowledge, a bad intercooler pump won't illuminate a light at all, just a loss of power with absolutely no warning or explanation, leaving you dumbfounded.

320Dreamer is a lot more knowledgeable than I am, perhaps he can share some insight.
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#9 Old 06-19-2011
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Unplugging the level sensor has no effect on the light, nor does shorting out the circuit. Should I try doing the same thing with the washer fluid level sensor?
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#10 Old 08-11-2011
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drum roll please.....


the answer is that it was the pre-fuse for the auxiliary fan. There is a separate box for four pre-fuses, and the one for the auxiliary fan was popped. I found out by taking it to the dealer, getting it scanned, and the code that was turning the light on was "faulty ground or bad fuse". I have a new fuse, and the light is no longer illuminated! Thanks for the suggestions. Maybe next time, I'll be quicker to take it in for a quick inspection.
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#11 Old 08-11-2011
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See, told you it was the fan... ..


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#12 Old 12-05-2011
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Same exact problem!

Sir,

Can you tell me where this separate fuse box is located (any pic's). What size was the fuse? My wife's car is experiencing the exact same issues you have been beating your head against the wall about. Any help would be greatly appreciated! She has a 2003 SLK230 w/215K miles on it. Thanks!

Mike

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drum roll please.....


the answer is that it was the pre-fuse for the auxiliary fan. There is a separate box for four pre-fuses, and the one for the auxiliary fan was popped. I found out by taking it to the dealer, getting it scanned, and the code that was turning the light on was "faulty ground or bad fuse". I have a new fuse, and the light is no longer illuminated! Thanks for the suggestions. Maybe next time, I'll be quicker to take it in for a quick inspection.
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#13 Old 12-05-2011
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Quote:
Originally Posted by millerm77 View Post
Sir,

Can you tell me where this separate fuse box is located (any pic's). What size was the fuse? My wife's car is experiencing the exact same issues you have been beating your head against the wall about. Any help would be greatly appreciated! She has a 2003 SLK230 w/215K miles on it. Thanks!

Mike
Welcome from New Hampshire, there are two fuse box's. One is in the engine bay, the other is located through a side panel drivers side dash. Open the drivers door and remove the small side panel.
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#14 Old 12-05-2011
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#15 Old 12-05-2011
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Fuses are all okay!

I check all the fuses out and they are all okay. I also hooked up my OBD II scanner and wasn't able to pull any codes. I let the engine run long enough for the fan to come on, so it's not the fan. I pinched the radiator hoses and couldn't feel any flow of antifreez fluid moving. So I'm thinking it might be the thrermostat or the water pump. Thoughts?

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Welcome from New Hampshire, there are two fuse box's. One is in the engine bay, the other is located through a side panel drivers side dash. Open the drivers door and remove the small side panel.
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#16 Old 12-06-2011
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Other than whats been mentioned above i don't have any thoughts that could fix your problem.
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#17 Old 12-09-2011
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@Millerm77

Here's a pic. I've labeled the fuse that I was talking about. It's attached to the battery, it's a pre-fuse from the battery to the high powered stuff. My bad fuse was the "electric suction type fan", F2-50A. It's just a little black box with a hinge opening toward the front of the car. It just clicks open and closed.

http://imageshack.us/photo/my-images/843/slkfuse.jpg

picture taken from passenger side front

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#18 Old 12-09-2011
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Nice find, glad you got it sorted out.
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#19 Old 04-06-2012
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You are a lifesaver!!! Same problem... Tried replacing/fixing EVERYTHING then today I find out the fuse is blown. urgh.. haha.
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#20 Old 02-22-2013
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resistance range for the coolant sensor?

My 98 230slk has the persistant coolant level light problem. Someone mentioned a float in the overflow tank. Mine has a free-floating thing that seems to be there to prevent overfilling. I see no way that it connects to the sensor. I removed sensor and got about 100 ohms resistance. Anyone know the correct value? It's raining right now or I'd try some of the other ideas from here. Also, I have the separate washer fluid light, which is not on, so it doesn't seem to interact. Am I wrong about this. Really glad I found this group. My wife wants to drive the car forever.

Thanks.
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