Help My 2002 mini cooper has started making a really loud fan noise when running and after turning engine off. Sounds like a plane taking off. My local garage are unsure of fault but engine is at 114 degrees even though dashboard does not show and temperature increase. They suggested replacing thermostat first and if this doesn't work change the water pump. Also small leak in radiator and they say that needs replacing. All this costs £800!! Any ideas as to if it is any other these or something else.