If you are (very) lucky, the broken bit could be lodged in the thermostat housing. If its not there, it could be anywhere in the cooling system - just hope that its not lodged in one of the cylinder head waterways......
You can try back flushing, but people have had mixed results - try using the search function for broken impellers.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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