SL-Class (R129) 1990-2002: SL 280, SL 300, SL 320, SL 500, SL 600, SL 60 AMG

SL/R129: Windshield Fuild into Coolant System

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Old 10-10-2006, 02:12 AM
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1999 SL 500 & 2011 E 550 4Matic
Windshield Fuild into Coolant System

The Windshield Washer System fluid level light was on. I bought an "All Season" washer fluid.

The owner's manual has the engine fluid reservoirs incorrectly labeled. Which led me to top up the Coolant Reservoir with about 3 cups of Windshield Washer Fluid .

After realizing this error I sucked about 3 cups of liquid out of the Coolant Reservoir so that it was not over full. But the fluids are mixed up in the reservoir now, which can not be reversed. We have not started the car up since.

The coolant system was flushed during regular maintenance about 6,000 miles ago and was currently at a full level.

What bothers me now is that there has been 3 cups of water, weak antifreeze and soap solution (which is the "All Season" washer fluid) mixed in with our coolant system fluids which is water and a higher concentration of antifreeze.

Will the small amount of soap alter the Ph of the system?

Should I have the coolant system flushed just to be safe?
Old 10-19-2006, 03:31 PM
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ML320, Looking for my S4
I'm going to go to the benz dealer tomorrow and i'll ask for you, But i think if you flush it, it should be fine.

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