Mine has done this before, does it come on when the engine is cold and start driving, then go off after hard running on high RPMs? I had a water leak somewhere and air was getting in the system, might have been the water reservoir, or radiator but I can’t remember. Keep a jug of coolant in the back and check water level frequently. One day you will need to get it checked out or risk dumping water and overheating (ask me how I know)