My 95 Chevy Lumina overheats to 260 hot light comes on-no heat-Hot air blows temp goes back to normal-coolant light comes on for a sec the temp then begins to climb back up 260 degrees what could it b?

Thermostat problem, head gasket, coolant leak, cooling fans on rad not coming on or coming on at the wrong time/temp.

AnswerThermostat problem, head gasket, coolant leak, cooling fans on rad not coming on or coming on at the wrong time/temp. AnswerI don't know what is causeing the vehicle to over heat. However, I can tell you there is a trick to releave the pressure on certain valves so you can get to were your going.. or if your stuck in traffic..Put your heater on full blast and roll down the Windows that will hold you over until you get her in the shop.