I was out driving earlier and the Coolant/Air Con light came on. After turning the car off and back on the engine management came on.

The car is not over heating and coolant level is fine. I have just been out to the car and put the blowers on, when turning the air con on you cannot hear it kicking in.

What will be the likely problem? I can get it plugged into tech 2 tomorrow but whats the worst i can expect?