12.44 volts is a little low. A fully charged battery produces 2.1-2.2 volts per cell, so 12.6-13.2 is normal. It is highly possible that the battery has voltage, and enough power to run the radio, dome light and such, but not enough amperage to crank the car. Have the battery tested, and make sure all your connections are clean and tight. There is a ground that goes to the bracket under the factory air cleaner assembly that may have come off or is corroded. The white smoke from the air cleaner is probably vapor from the crankcase. The factory air inlet has a tube that runs to the rear valve cover, and is part of the crankcase ventilation system. If this tube isn't hooked up, it will allow the hydrocarbons to build up in the crankcase and it comes out as a white smoke, normally out the throttle body from the pcv valve. Make sure the PCV valve isn't gunked up with sludge. The fans don't come on until about 230, so 220 isn't overheating.