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SLK230 + C230
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Discussion Starter · #1 ·
My radiator light keeps comin on. The car isnt over heating or anything but it keeps coming on. I've checked the fluid a few times as well.

Any Ideas?

Thanks,
Aaron
 

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2002 SLK32 LED taillights. 2002 SLK230 BVRC Ported supercharger ASP pulley Led taillights.
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622 Posts
Radiator light also comes on when the windshield washer fluid level gets too low.
 

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08 ml320 cdi,slk 230,01 boxster S,04carrera911, 99 S320,67 GT350mustang,02G500L,96 s600 w140, e55 2k
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1,697 Posts
yup, check windshield washer fluid
 

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98 red 230 slk
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454 Posts
What they're trying to say is low washer fluid and low radiator coolant light up the same light!
 

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2003 SL500 USA model, Auto Transmission, Stock, Aegean Blue Metallic
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1,475 Posts
You can try topping off the radiator tank with distilled water even though the fluid is at the right level.
 

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1999 SLK230 2009 E350
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553 Posts
There have been a lot of posts stating low coolant and low windshield washer fluid turn on the same light. I have separate warning lights on the dash of my slk and I've never seen any interaction between the two and I have had instances when one or the other has come on and it has always been a correct inidcation I was low on either fluid depending on the light.
 

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2008 ML350; 2001 SLK230 (traded in)
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1,006 Posts
They're two different warning lights.
 

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SLK 230
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The float valve in the neck gets stuck. stick your finger in to loosen it and top off the fluid to bring the float up to the very top.

A 1/2" low on fluid will set the light off.
 

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2012 SLK350
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405 Posts
Yes, I know it is counterintuitive. Don't argue with the old pros here. It is likely low on washer fluid or just as likely a bad washer fluid level sensor (been there). Discussed to death.

Do a search.
 

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1998 SLK 230
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2,882 Posts
yeh they both use the same circuit (they way they are wired up) and depending which one gets tripped a diff light comes up.

my dash has 2 lights one for washer and one for radiator. but funnily enough only the radiator one comes up if i have low coolant or low washer fluid.

my car recently has the light intermittently comming up and washer fluid is fine and coolant level is 100% fine and float is all good.

just replaced the coolant level sensor in the radiator expansion tank and so far nothing... in my case was faulty sensor. annoying yes, but still OK to drive around like that as long as your coolant levels are fine.

sensor isnt that all expensive can get it online...
 

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Two 1998 SLK230s, 2003 SLK230 SE, 2002 ML320
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920 Posts
Two sensors on a common circuit feeding two dash lights. Bazzle posted a solution to this a few years back. You likely have a bad sensor circuit in the radiator top-up tank. It is a common fault. Yo can fix it yourself with a bit of work or get the new part (whole tank) for several hundred $. This has happened on all the SLKs I have owned (3 of them).
 

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1998 SLK 230
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2,882 Posts
coolant sensor can be bought seperatly... i had to replace my expansion tank as it had a crack in it and it was starting to weep at the crack and my old coolant level sensor was popped in.

below is info from WIS on how to test it (if you wish). can be removed without any coolant loss. just need a multimeter and a magnet to test it.

just checked autohausAZ online and you can find one for about $14.

Your Parts Search Returned 1 Part(s)
 

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SLK230 + C230
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Discussion Starter · #14 ·
I put windshield washer fluid in it and it seems to have fixed the problem.
It is on 2 different lights.

Thanks.
 

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08 ml320 cdi,slk 230,01 boxster S,04carrera911, 99 S320,67 GT350mustang,02G500L,96 s600 w140, e55 2k
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yup. this has been a regular issue
 
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