GoodAfterrnoon,<br/><br/>A question for all who may know, My 1984 Foretravel has two furnaces, one in front one in the rear. The front one works great, always lights, and throws seriously hot air. However the backone lights hrd, sometimes not lighting, and when does, throws luke warm air, rather than the hot air like the front. I would assume that part of it should be cleaned...