This afternoon after stopping the engine and locking the car the cooling fan came on. Thought I was hearing things and assumed a neighbour was using a particularly noisy lawnmower and who the heck was cutting grass in the rain. The fan kept on for ages, went off then came on again. I called out the RAC hoping to avoid a complete breakdown tomorrow with a dud battery. Mechanic ran a check on the cooling system which seems to be fine - no leaks found. What he did say was that the fan is staying on way too long rather than sporadically responding to hot water passing a sensor I assume. Has anybody had any such problem before or any idea if this is a warning of something about to give way.