1/ if your wire to your coil drops off, do not simply put it back. It will drop off again 10 meters up the road. From your glovebox get a nikko pen and a torch and squish the clip tighter together and then replace. 2/ If your bus is overheating, the VERY FIRST THING to check, is that the dust seal hasn't been sucked up against the fan. 3/ Even though you may hate your temperature gauge, it will tell you when something is wrong, watch your gauge, you can see the temp, but you cannot hear or smell or feel a dust seal blocking your fan.