The water pump for the two types is different. The water pump for the old type of cooling system has a T in it. The extra port goes to the reservoir. In order go New to Old w/o swapping your water pump, you need to T the hose to the waterpump. Chuck Baader made the T for me in the pic, but there’s lots of ways to make this work. The line is not under hardly any pressure so a plastic T would do.
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