I've burped the cooling system several times with no problems. I followed the directions on Pedro's board, then, with a gallon of coolant, I drove around gently with the bleeder valve open, going up and down a parking lot ramp, to slosh everything around. Had to add about a half gallon after that and its been perfect ever since.
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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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