anti-freeze coolant liquid, either your reservoir opened up, their a leak in your lines, or worst case scenario, you busted your radiator wen it tipped over which takes a hefty chunk from your wallet to replace. find the problem and fix it as soon as possible and dont run your sled incase theres a leak and it overheats. if you cant find where the leaks coming from just pour water in the coolant reservoir until u find where its dripping from.