It could be the thermostat housing leaking or a temp sending unit. You need to dry things off and get yourself a pressure tester for the cooling system. Many parts stores will lend them to you. All you do is when the engine is cold, attach the tester (which is nothing more than a pump) to the radiator and pressurize the system. At that point, the leak should show up. If you clean the area prior to doing this, it makes it much easier.
As far as the smoke, I need to know what color it was, blue, black, white. If it was white, chances are you have a bad head gasket.
Let me know.
Friday, March 22nd, 2013 AT 5:34 PM