US Patent 7913785 Snowmobile cooling system

A snowmobile is disclosed having a frame. A tunnel is formed in a rearward portion of the frame. An engine disposed on the frame. A drive track is disposed at least in part in the tunnel and is operatively connected to the engine for propulsion of the snowmobile. At least one ski is operatively connected to the frame at least in part forwardly of the drive track. A straddle seat is disposed on the frame at least in part above the drive track. A steering device is operatively connected to the at least one ski for steering the snowmobile. A radiator is disposed between the tunnel and the track. The radiator has a first side facing the track and a second side facing the tunnel. The second side is generally opposite the first side. At least a portion of the second side is spaced apart from the tunnel.