I just broke the blue plastic plug as well - twisted the head off but threads are still in the radiator. I put a little water in to see if it was going to leak - and it's not. But I know the system isn't pressured either...

I really don't want to waste $20 of coolant - anyone know the thread size (I can't get the thing out either).

ryan

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RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE