Firefighters recovered the remains of two men from a burning van in Sunset Park last night. The victims — whose names have not yet been released — were apparently homeless and lived in the van, which had been parked near the Gowanus Expressway at the corner of 45th Street and Third Avenue for two years, according to neighbors. Investigators told the Times it's possible that the men, who were pronounced dead at the scene, had set a fire to keep warm. Last winter, a homeless man was found burnt to death in Owls Head Park, just 20 blocks away from yesterday's Sunset Park blaze. In that instance, police surmised that the victim had surrounded himself with candles to keep warm.