Dana Corp. said Wednesday that it will close three thermal products group plants, including a plant in Burlington, Ont., as part of its ongoing effort to cut costs. The closure of plants in Danville, Ind., Sheffield, Pa., and Burlington, Ont., affect about 200 hourly and salary employees. The plants produce small radiators and heat exchangers and will close by the middle of next year. Toledo-based Dana said in October that it would close two Virginia plants and sell parts of its business. The company said reductions were needed after cutting its profit forecast for the year in half because of soaring energy and steel costs. Many other auto parts suppliers are struggling as well because of increased costs. Dana earlier this year also said it will cut its salaried work force by 5 percent and restate its financial reports from 2000 through the first part of 2005 because of an accounting requirement. Dana plans to narrow its focus on its light- and heavy-vehicle drivetrain products and sealing and thermal products. Work from the three latest closings will be shifted to plants in St. Clair, Mich., and Cambridge, Ont. The company currently employs 46,000 people in 28 countries.