Was driving my ML on the interstate and pulled off to get gas and noticed and burning smell and smoke coming from the engine on the passenger side. I opened the hood and saw a wire that looked like it went to a sensor or control dealing with coolant since coolant hose appeared to be connect to this. The car was not running hot nor any warning lights were on. I had to pour water on the wire to put out the flame. The car will start and run but i am afraid to drive it. Does anyone have a clue what this could be?