Searing summer heat has forced car maker PSA Peugeot Citroen to trim production at its French plants as it grants sweltering factory workers extra breaks, the company said on Tuesday, according to the Reuters news agency. PSA, which is already scrapping weekend and third shifts as profits slide amid a fall in demand for new cars in western Europe, said the lost time from extra "heat breaks" meant it was making roughly 50 fewer cars in France per day, the report added.