Ok, just tried this. As i assumed, the hose was full. I lost more coolant that way from the top of the radiator then i could put in the hose. It took none this way.

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I'd still wager that you've got air in the head. Get the vehicle on an steep upward incline so that the radiator is higher than the head...........and run the engine for 20 minutes.

Then, after it cools, repeat the attempt to fill the upper hose.

...with the heater on full blast.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13