The radiator is not only two positions! Push the "open rad" key and watch the crank on the right side of the cockpit, 3 and a quarter turns from closed to open.
Further is there a indicator pin on the right wing, though in reality it worked just the other way, it works -> full out -> rad open.
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Win 7/64 Ult.; Phenom II X6 1100T; ASUS Crosshair IV; 16 GB DDR3/1600 Corsair; ASUS EAH6950/2GB; Logitech G940 & the usual suspects
 
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