S-Class (W220) 1999-2006: S 320 CDI, S 320, S430, S 500, S 600

2005clk500

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Old Dec 4, 2017 | 12:52 PM
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Mb clk500 2005
2005clk500

I noticed engine coolant dash light said low coolant so I filled it, after driving 20 miles light on again, refilled, happened again and again, noticed water dripping under windshield washer tank and radiator, could not see source. Ran car while looking for problem, warm water started squirting from tiny hole in top of filler tube cap for windshield washer fluid reservoir and fluid level down again in coolant reservoir. How can coolant fluid get into windshield washer reservoir and be forced out from there?
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Old Dec 4, 2017 | 10:51 PM
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From: Ball Ground, GA (N of Atlanta)
2003 S500 2007 GL450
This is a W220 forum, so we might not be able to help much with a CLK, but...
On my S430, there is a coolant circuit that goes into the washer reservoir to heat the washer fluid, so my first thought would be that your car has a similar fluid heater circuit that is leaking.
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