The Detroit Three automakers are showing increased interest in the United Auto Workers union’s proposal that they pool their healthcare systems, a sign that contract talks between the union and manufacturers are down to the big money issues. The UAW and bargainers for General Motors Co (GM.N), Ford Motor Co (F.N) and Fiat Chrysler Automobiles (FCHA.MI) (FCAU.N) face a Sept. 14 deadline to negotiate new labor agreements for 142,000 U.S. workers. Rising healthcare costs have emerged as a stumbling block in the way of raises for blue collar workers.