Mercedes-Benz Automatic Climate Control System II Installation Manual And General Information page 12

12 of 20
Step #8: Control Unit Vacuum Source
1) The dark green vacuum line coming out of the new central control unit will be the kit's
vacuum source. This must be connected to a constant source of vacuum, for example the
vacuum reservoir line. See steps #2 or #3 for adequate vacuum sources.
2) (for w116 and w123 only) Behind the brake booster, you will find a three-way
connection between a yellow line, black line, and grey line. The black line branching off
the yellow vacuum source line is the best choice here, as it carries vacuum from the
driver's side to the passenger side (where you will mount the central control unit). Follow
this black line to the passenger side of the car. Then, cut the line and tap into it. The green
line coming out of the new central control unit is preinstalled with a three-way "T" made
up of hoses to tap into any of these lines. The two halves of the cut line will slip into the
two hoses coming out of the green line.
3) (for R107 only) The vacuum reservoir is located in the passenger front fender. Right
by the coolant tank (along the passenger fender), there will be a yellow and grey striped
line entering into the passenger fender. This is a good vacuum source. Cut the line and
attach it to the green source line coming out of the new central control unit. The two
halves of the cut vacuum line will slip into the two hoses coming out of the three-way
"T" on the green vacuum source line.
All rights reserved.