Hey guys, I'm new here, I'm 19 and I drive a 52 reg Astra G 1.6 16V. The problem I'm having is when the car reaches 90° the engine fan kicks in and I get what I believe is known as the "problem in the cooling system" warning light on the dash. Thermostat has been replaced, the car runs as it should warms up and cools down as it should, only ever overheated once and it was in a car park whilst allowing a friend to drive around which somehow caused it to overheat. Anyone help??