Put some UV dye in the coolant and pressurise the system. You should readily see where the coolant is leaking.
If you don't see an external leak, take out the spark plugs and and pressirise the system, then put a piece of hose in each spark plug hole and listen for a hiss. If you hear a hiss, my condolences, you have a serious problem with a cracked head.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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