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!
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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)
Black Sheep:
1985 524TD 167K (TotalDumpster™)
Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)
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