It goes up and down with temp. Dead cold it should be closed but as the car warms it will pop up. If it doesn't work this way, I would change the seals. Be careful, the screws that hold the valve together thread into soft plastic. Its very easy to strip the plastic threads and/or break the screws.
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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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