yousef_clk

Hello, I have a 2.6L 190E that has a heater issue. The heat only comes out of the defrost and foot vents, and every other vent blows cold air. After a lot of research it seems there could be caused by some sort of vacuum leak in the lines that power the vent flaps (that are vacuum driven). But there isn’t much clear information out there. Anyone might be able to help me figure out the problem? Thank you!