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Old 01-28-2002, 02:58 PM
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monovalve replacement


I replaced the monovalve in my 89 420SEL (112K on it) this weekend and I took it out for a short drive afterwards.
The next day I noticed the car had leaked coolant (it did eventually stop because most of the puddle had evaporated).
So it appears that I did something wrong in the replacement. Would anyone be able to tell me how to be certain to be sure the valve is replaced & seated properly?

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Old 01-28-2002, 03:40 PM
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Thumbs up leaking?

i believe you're all right. mine did the same thing, as it leaked when i changed the monovalve. just refill the antifreeze and see what happens. good luck
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Old 01-29-2002, 12:27 AM
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Location: Chicago
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I changed mine Saturday and it only leaked what was in the hoses once I took it out, no leaks after wards.

I would go back and check all hoses and make sure they are on securely and tight, make sure you push the hose until it stops.
1993 400SEL (W140) 281K
1999 S500 (W140) 163K (Sold)
2002 S500 (W220) 72K
1999 S500 (W140) 88K
You cannot simultaneously prevent and prepare for war.
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Old 01-29-2002, 06:35 AM
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I know that the coolant on the floor earlier did not leak out "while" I was changing the valve. It leaked out after the car was driven. Anyway, I took the car for a spin yesterday and let it sit overnight just as before....but it didn't leak. Weird.

I'm going to keep an eye on it though.

Thanks everyone!
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