I ran my Thundercat on Sunday on race gas tune. I made a pass on it, then let my buddy try it. When he got back, he just shut it off as he coasted to a stop. A few minutes later it was dripping antifreeze out of the overflow jug. I started the sled 3 times and let it idle for around 45 seconds to 1 minute each time and the engine temp went right back to 168 degrees, but the overflow jug is still full to the plug. Last night, I set the left ski on a 5 gallon pail, right ski on two 5 gallon pails and a 4x4 block on top of that, and left the back on the ground with it strapped down. Brought the sled up to temp and cracked the bolt on the turbo side and no antifreeze was present. Started the sled with the bolt out and let it idle until coolant came out of the hole and reinstalled the bolt. I did this probably 5 times last night, sometimes it would have coolant in the reservoir on the turbo side, sometimes it wouldn't. The overflow jug is still almost full to the top. Heat exchangers at the back of the tunnel are hot so it's circulating the antifreeze, but why would it just fill the overflow jug all of a sudden?
