I picked up a nice 600 XTC Deluxe for my girlfriend this year. After our first ride of about 30 miles, the temp light came on. Luckily we were just pulling into my yard. Coolant tank was empty so I filled it and warmed it up, filled upper hose, bleed air, etc. and repeat. It now seems to come on randomly on the trail so I've been bringing coolant with me and filling it through the pressure cap. I can't seem to find any leaks although there was coolant under the sled last time but that may have been from overflow or spillage. I was thinking of replacing the thermostat but I can't seem to find it in the parts fiche. Also, does anyone have suggestions to why it keeps overheating? Or any other suggestions for checking the coolant system?