Help heater issues
 

Hi I have a 2003 Limited 3.3 petrol grand voyager with a broken heater. I have searched through lots of posts but unfortunately can't find symptoms like mine. It started with not being able to control fan speed and when heater power turned off a fan under dash on passenger side continued at full speed. Temp and directional controls still worked, hot and cold although a/c never been really cold. Changed control unit in dash no effect,put old one back and few weeks later now nothing works except a fan in the rear. The control panel is lit and can change temp etc but no fans in front working. No power to dvd radio works but sometimes sound drops to nothing, connected? Didn't occur at same time.Any and all ideas welcome ad I am at a loss.