Added coolant to radiator 3 days ago and drained completely this evening no leaks or funny noises coming from the engine, thought it might have been the head gasket but can hear no irregularities or misfire of cylinders, now that I have driven my car home from the garage I can feel a rumbling in the engine and chugging feeling so I know my transmission coil is on its way out because when I sat stationary with the engine idelling the transmission light flashed but don't understand where the coolant is going can you help