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The coolant filter is used as a "bypass filter", only a portion of the coolant flows through it, but in time 100% of the coolant will have passed through it. The heater is also in a "bypass" config and it's okay to add another loop, which you can do by using a "T" fitting at the "in" and "out"...

The coolant flows from the top of the engine to the water pump (and to the heater and coolant filter, if plumbed in). The returns from the heater and filter go to the water pump. Follow the arrows on the heater and filter head. The inside of a filter element is always the output. Note: Some of...

This is what mine looks like.

Dave, I got my third filter today after your reminder. :-) $13.00 at Napa here for the 4070. I have not cut them open in the past, but will do this one, should be a winner with some 10,000 miles on it. :oops:

Interesting, thanks for the reminder, I need to change mine too, perhaps this week. It's a bypass filter in a loop like the heater.