Help! 03 gtx 4 tec overheating

[Jtb615]

Had nothing but problems since I got the ski. Fix one problem just to find another one. After about 10 minutes I get a warning buzzer and overheating. My gauges don't work so I'm not sure what code it's giving. The coolant level is still the same as it was when I filled it up. Clueless about what it could be any help would be greatly appreciated thanks