I am trying to find out if the 1985 190e has a timing belt, chain, or a serpentine belt on it. I am trying to find out how hard it will be to replace the water pump and what ever is driving the water pump.

It has a timing chain, which has nothing to do with the water pump. The water pump is driven by a belt. Is it a 2.3 or a 2.6?

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible