Hyundai Motor, South Korea’s largest carmaker, will build a third plant in China with an annual production capacity of 400,000 vehicles. The new factory will increase Hyundai’s production capacity in China to 1 million vehicles a year. Construction of the plant, which will be located in Beijing, is to be completed in 2012. Hyundai aims to boost sales in China to 670,000 vehicles this year from 570,000 last year. The carmaker said it sold about 437,000 vehicles in the country in the eight first months of this year.