Interesting that the nipple exists. I'm not sure if my wp looks like that (mine is a Graf brand), but I would definitely get a long piece of tubing and disconnect the hose going into the fender and reconnect the longer hose there and run that to the nipple of the wp. That way you don't loose coolant and also it will extend the usage of your wp since its still functioning and the only problem is a leaking seal.

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1990 190E 3.0L