Fogging the sled for the summer and getting it all cleaned up. I noticed the overflow was filled and i opened it and some antifreeze overflowed out. I know it was at the line all winter could it pressurize being in a heated garage or do i have another issue to look for. Sled ran great and never had a issue with it. I just fogged it don't really want to start it but might have to to see if it sucks the antifreeze back down to the cold line. Any idea's