carboy2800

My 99 SL600 does not blow air from the center vents. On the vacuum box in the engine bay, I have the grey line which is the main supply going into the box and then 3 going out into the car. I have 1 green and 2 red. The green line is for the center vents but what do the red lines go to? This is the only diagram I can find, and it only shows 1 line going into the reservoir in the car. If I remove the 2 red lines from the vacuum box, air blows from the center vents, but not the sides. As soon as I plug the 2 red lines back in, no air comes out of the center vents but again blows from the sides. I assume something off of the red lines is leaking, but not sure where they go. If I apply vacuum into the green line, the center vents open. Anyone have a different diagram?