I think it has the automatic exhaust diverter that's on the titan 575. When it reaches a certain temp, it just turns the exhaust away from the coils.I have no problem with air cooled engines but I am wondering how they control the heat. Are they bypassing to the waste tank? Does it come with an auto pump out? Air cooled is simpler and easier to work on and a lot of problems I see is because guys want to shut their doors. You always need air passing through the van.