Right side drain...
Just behind the motor mount, directly above the carrier axle and in front of the starter. Tight quarters in there for a wrench and my arm. But got it out, cleaned the passage and drained the right side as well.
System is topped off with 50/50 mix plus water wetter. Running very cool now. I even sat in the driveway, in gear, foot on the brake and A/C on for five minutes trying to get the temp above 180. After five minutes the temp rose to almost 200. I think I'll be good to go for stop and go driving if I should run into any.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.