Unless your system is a bit overfull and your overflow tank fills right up, it's hard to tell exactly from that.

You really need to open the radiator drain and drain a bit out into a container and look. The drain is on the driver's side bottom of the rad... the plug has an X-pattern head so you will need a wide flat screwdriver to open it.

If you don't know how long its been in there, you could do worse than do a drain, flush and refill in any case. You can either use Mercedes AF or Zerex G-05.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22