Black rubbery deposit in radiator hose

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Black rubbery deposit in radiator hose

05-08-2020, 12:29 AM

AjfromColo AjfromColo is offline

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Join Date: Mar 2007

Location: Arvada, Colorado

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Black rubbery deposit in radiator hose

I’ve an 82 300D. Today, when changing my hoses, I noticed that inside of the top radiator hose a rubbery deposit that I mentioned above. Any clue, anyone?? And, i need to do what to correct this?
Btw, the coolant was green. However, my MB garage mentioned I should switch to G38.
Any thoughts would be appreciated.

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