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Before filling the system, I stuck a hose in the top of the radiator and removed the drain plug to try and flush as much crud out as I could
What colour was the flow ?
I broke my bucket
This is the flow out of the drain plug with the hose in the top pipe - I couldn't turn the pressure up very high because it would just blow back out the top.
I gave the bleed pipe a good blow from the rad side, and I could hear the bubbles in the expansion tank
That look like a restricted flow ...
Take the rad off and lay it flat on the floor and do the same flush ...