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Stand at the front if you can
hear the pumpwhirringwhen activated from inside the car by a mate. Try draining all the water using a siphoning hose refill it with a garden hose to shake any rubbish lose siphon it out again, then fill her up with hand HOT water give it about 11 minutes then pull the switch if it does go, keep if flowing for some time.
BTW you have checked for blocked jets, I guess.
Currently in hondo's garage:
1.6 Valve-Matic SR. Red hot, toasty feet.