I have a 2000 Mercedez Benz ML430. My heater stopped working. I took it to a mechanic and he said there is hot water going in and hot water coming out but it only blows cold air. I would really like to get it fixed but no one knows whats wrong.
There will be a problem with the blend doors, dose the system shift air from the floor to face to screen? These are a fairly complex system, you may be better off contacting a dealer as general mechanics may not have the expertise on this problem.