Climate control vacuum line routing

[rp930]

I have discovered why my ccu is not functioning properly, not to bore anyone with my stupid mistakes troubleshooting the climate control system. I need to run a new vacuum tube line from engine comp. to ccu manifold. Where does it go through firewall ? Or enter cabin. Thanks all, will do a post with my results with vacuum going to system.

[rp930]

1983 300sd sorry

[toomany MBZ]

Not sure, perhaps red/blue is for the CCU.

Any vac line will start with the main line, go through the fake firewall.