Wow... I guess they didn't read the instructions... you're supposed to crumble them up and pour the stuff into the radiator... it's like compressed alumaseal. Personally, I wouldn't leave it... especially not in big pieces. Could break up and clog the radiator, thermostat and possibly chew up the water pump impeller. Can you break them up with a screw driver and wash them out? A bypass filter on the TB's coolant line could be employed to filter out any unwanted remnants over time.
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