I have a 2000 C280 Sport w/ 165k miles on it. One day the A/C stopped blowing from the middle dashboard vents and would only blow from the side dashboard vents (near the doors). Instead of blowing from the middle vents, the cold air starting blowing through the defroster vents causing me to use the wipers to remove the condensation. Does anyone know the reason for this? Thank you in advance..

 

Here is lots of reading for you https://mbworld.org/forums/c-class-w...g-hissing.html