funny but being my sensor is dead or dirty and its unplugged, and i had some head gasket leak deal that blue devil seemed to fix ive been checking mine weekly, one time it was like 2 inches low in the rad, but i had no coolant or water to add. so the next day i go to fill it and its full and coming out as i undid the cap lol hows that for a wtf moment? same thing every day after that too.