4 Wheel Drive/SUVs: LANDROVER DISCOVERY 2004, landrover discovery, head gasket

Question
My 2004 Landrover Disc high temp indicator illuminates at idle but goes to normal temperature (extinguishes) once the vehicle is moving. I recently change the coolant. What is/are the possible problem(s)?

Answer
I just had one at my dealership last week and it was doing the same thing , and we tested it out and it ended up being the head gasket... Not saying that yours is the head gasket, but its a possibility have someone check it for C02 with a tester thanks ADAM