Trying to think how it could have been fit incorrectly, more likely failed as the impeller has come off the shaft.
Did I mention there is no liquid returning from rad to expansion tank? Pulled it off and not even any air
The expansion tank is connected to the rad by a small bore ish pipe, and you disconectted the pipe and revved it and no water came out. Is that correct?
@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.