The United Auto Workers union is pressing the Detroit car companies for a two-week shutdown of U.S. factories over coronavirus concerns, a move that would deal another financial blow to auto makers already grappling with virus-related disruption globally. In a message sent to union members Tuesday, UAW President Rory Gamble said union leadership Sunday had asked General Motors Co., Ford Motor Co. and Fiat Chrysler Automobiles NV to idle their plants to protect workers from the virus. But the car companies were unwilling to…