New Heater Matrix

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Check the heat in the pipes into it. Is one getting almost too hot to touch? Then the engine is supplying the heat. If not you've got a blockage or air lock or your temperature tap is out of whack.
 
Can't quite see what the make of the matrix has to do with it, I used a BP replacement and it was fine. Is the engine reaching the correct operating temperature?

Assuming you sealed the matrix in correctly it is more likely that the cables / flaps aren't adjusted or there is an airlock (the latter is unlikely due to the amount of time that has passed).
 
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