Originally Posted by Diseasel300

Seems once again the repeated suggestions to *OBTAIN A SERVICE MANUAL* have gone ignored. There's a reason Mercedes printed these things and they hold ALL of the answers to your questions.

Need a vacuum diagram? It's in the manual!

Need a wiring diagram? It's in the manual!

Need troubleshooting information for the HVAC system? It's in the manual! Along with troubleshooting flowcharts!

Save your hair from being pulled out, get a copy of the FSM. Seriously, it'll save you a lot of time and make life a LOT easier to troubleshoot your car!