ps2cho, before pulling the water pump again, check the O-ring on the coolant pipe that attaches to the water pump and runs across the front of the engine to the auxiliary water pump. The last time I replaced the water pump on our 1995 E320 I inadvertently damaged that O-ring and coolant appeared to be leaking at the joint between the water pump and block. I really did not want to remove the water pump again, so I examined closer and noticed coolant leaking from the upper end of the coolant pipe. Simply replacing the O-ring on the end of the coolant pipe fixed the leak.

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Fred Hoelzle