Some flow should still go through the system, even with the small diameter hose. I bet you still have some air in there. The best way I found to get all of the air out was to drive for a few minuets at a high RPM. Be sure to check the coolant level often.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine