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

Run on completely distilled water?

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Old 09-29-2018, 05:58 PM
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99 E55, 00 S500, 01 CLK55, 01 E320, 04 E320
Question Run on completely distilled water?

Hi family,

Trying to fix my upper radiator leak. I dont see any cracks but its either hose (with U clip and O-ring) or radiator. I took it off and lost significant amount of coolant. I will replace hose first, but I hesitate to use expensive coolant before I am 100% sure that no more leaks.

So my question is: is it okay to run my S500 completely on distilled water, if yes how long I can drive it with it in.
Old 09-29-2018, 06:34 PM
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2003 CL 600
The mixture is half water to coolant anyway, you can run mostly all water if you aren't in a freezing climate, but there should be a little coolant in there for corrosion prevention functions. I doubt you got the system 100% dry before refilling so you are probably ok there anyway, but yes, fill it with water, pressure test it, if all good, drain off a half gallon or so and add coolant.
Old 09-29-2018, 07:45 PM
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99 E55, 00 S500, 01 CLK55, 01 E320, 04 E320
Originally Posted by ItalianJoe1
The mixture is half water to coolant anyway, you can run mostly all water if you aren't in a freezing climate, but there should be a little coolant in there for corrosion prevention functions. I doubt you got the system 100% dry before refilling so you are probably ok there anyway, but yes, fill it with water, pressure test it, if all good, drain off a half gallon or so and add coolant.

thanks mate. Btw, do you use blue or yellow coolant in your system?
Old 09-29-2018, 10:09 PM
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Originally Posted by noud
thanks mate. Btw, do you use blue or yellow coolant in your system?
either one is fine . Usually Better to use the same color as it currently uses, otherwise if you mix the blue and yellow it will look like green coolant .

It will perform fine but look incorrect to a future buyer who will think you just put in the green stuff
Old 09-30-2018, 07:33 AM
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Originally Posted by ItalianJoe1
The mixture is half water to coolant anyway, you can run mostly all water if you aren't in a freezing climate, but there should be a little coolant in there for corrosion prevention functions. I doubt you got the system 100% dry before refilling so you are probably ok there anyway, but yes, fill it with water, pressure test it, if all good, drain off a half gallon or so and add coolant.
Back in the day we would use a hand pump to pressurize the system to look for leaks. Is that not done anymore? (been a loooooong time since I worked on anything besides my GTO).
Old 09-30-2018, 02:21 PM
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Originally Posted by pjw1967
Back in the day we would use a hand pump to pressurize the system to look for leaks. Is that not done anymore? (been a loooooong time since I worked on anything besides my GTO).
Yeah, still done all the time. I'm assuming OP doesn't have one?
Old 09-30-2018, 04:38 PM
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Originally Posted by noud
Hi family,

Trying to fix my upper radiator leak. I dont see any cracks but its either hose (with U clip and O-ring) or radiator. I took it off and lost significant amount of coolant. I will replace hose first, but I hesitate to use expensive coolant before I am 100% sure that no more leaks.

So my question is: is it okay to run my S500 completely on distilled water, if yes how long I can drive it with it in.
If you are near an Autozone you may be able to "borrow" a pressure tester to check for leaks. I imagine other auto stores may have loaners as well.

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