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russ132, Coolants designed for diesel engines have an additive the helps prevent cavatation of the coolant around the sleeve area in the cooling system. My understanding is that there is a certain harmonics that takes place in diesels, that isn't present in gas engines that can & will cause...

I agree with gimpyrobb, your filter is simply taking up space the way it's hooked up in the picture. The only time any coolant would flow thru the filter is when the flow to your heater core is blocked off. There's diagrams in several posts by cranetruck on this, but you'll need to go back and...