Trying to think how it could have been fit incorrectly, more likely failed as the impeller has come off the shaft.
Took it out for a welly this morning. Actually with a bit of umpf it overheated pretty quickly. Felt radiator all over and bottom drivers side is pretty hot, the rest of the rad is still completely cold.
It is looking like a blocked/clogged radiator to me.
Any decent rad places that could recore to a higher spec aluminium core, or would a modern rad be a decent aluminium core.
But lets see if the headgasket has failed again.
@Jw89 started
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Trying to think how it could have been fit incorrectly, more likely failed as the impeller has come off the shaft.