Flushing cooling system
I just flushing the system on my 1982 300D-Turbo and I must say it wasn't fun. Wasn't hard or too easy. The drain plug is located on the right side of the engine below the manifolds and in front of the starter.This procedure is according to the factory manual for Mercedes;
Fill system with a 5 per cent mild degreaser solution
Run engine at 80 degrees for five min.
Stop engine and let cool. Drain the degreasing solution and flush two times with clear water.
Fill system with 10 percent solution of citric acid and water.
Run engine at operating temp for ten min.
Drain acid solution and rinse three times allowing engine to run five min. on each flushing.
Part no are: Degreaser 001 986 21 71
Citric acic 000 989 10 25
Use anti freeze to your choosing.
Bill Lewallen Lexington,Ky.