Ok guys, I've had my supra for about a year now and there's always been a coolant issue. At one point you could drive it for a little bit and be fine, but then it'd start pushing coolant out, so after a while the water pump went, and now it's doing something I've never seen. I got a new gauge sensor because the one day I saw the gauge rapidly fluttering up and down. So, last Friday I went on a drive with my cousin , wasn't driving it too hard but when we came to a stop the temperature rose, until I started driving again. Then it went back down, so he suggested that there could be a clog somewhere in the hoses. Now today I was driving around and granted it's around 95 outside, it was 75 on Friday, but now it does the opposite of what it did on Friday. It got hot when I drove it and stayed at a steady temperature when stopped. I'm very stumped as to what it could be. I don't think it's the HG because I pulled the valve covers off and checked the torque of the head bolts which were torqued to 74 ft lbs. I'm going to put in a 3 core radiator when I get the money, but if anyone has any suggestions on what it could be that'd be great.