I always disconnect the upper radiator hose at the radiator itself and fill as much coolant through that hose as I possibly can. I then top up any needed amount through the expansion tank. This is especially effective on V8 engines as they are known for air pockets. If the temp only hit 100 celsius I wouldn't worry that you overheated it. Those lifters on the 603 motor are notorious for clacking loudly.

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Regards,
Aaron