I have a 2004 ML 270CDI SE and the rear vents have never blown hot air since new,no matter how hot i set the temp to. I was unaware that the rear vents are actually capable of blowing hot and cold air until i was told by a garage. Now the warrenty is out im reluctant to get mercedes to take a look at this until i know what the problem is. I think you get 2 blowers each one activates depending the on what temp you have set but i think the hot air vent is failing to open, maybe the motor is faulty as it has never worked.
Any ideas?
Any ideas?