1990-1998 Arctic Cat Snowmobiles Repair Manual, Page 316Get this manual
306 light bulb and check for leakageIf light can be seen around the edge of the valve, the thermostat is defective and should be replaced
CHAPTER ELEVEN
seal (Figure 15) located on the cover can be replaced without disassembling the crankcaseIf the internal seals are faulty, refer to Chapter Five for service procedures