Someone told me to leave the drain-plug on the engine block alone, if removed it could cause coolant to leak.

I flushed mine by removing the hose in the rear of the engine. It was a messy job, next time I will leave it to my mechanic!

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).