IMHO ........ if one cannot make a truly divided core as VW clearly did, it would be a better solution to NOT have in and out tubes from the same end tank.
Make the core less tall and run the return ...
I cut my Thermex one open to see why it wouldn't heat up.
I reckon the gap under the scalloped edge of the divider lets all of the coolant flow in one pipe and directly out the other without being fo ...
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