Has it been established whether the OP's Euro has a manual system or ACC?
While my '84 non-turbo Euro 300TD has the manual heat-AC system like a 240D, I believe the ACC system was optional on Euro models, as I saw an '84 non-turbo Euro 300D in the Virginia Beach Pick-N-Pull last year with the ACC system.
I don't remember if it had an aux-pump.

Happy Motoring, Mark

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DrDKW

regardless of the pump, if both your heater hoses are good and hot to the touch after full warm up, it's likely vacuum problem. if they ain't hot, then r&r t-stat, check heater control or mono valve, whatever they got (i don't remember off the top of my head), most default open. flush coolant and maybe run a garden hose in the heater hose to make sure you got good flow through the heater core. then retest.
i have seen people put card board in front of the radiator to block air flow, but that kinda scares me it'll over heat.

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1984 300TD "MAX" 303K+ still going...
fast '70 Chevelle 200k+
home built Shovelhead chopper

I did the cardboard in front of the radiator and it got the temp up to 80C but I'll be looking into the TStat once weather is more favorable. Even with the cardboard, though, my 300D still runs a bit cool.

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Codifex
1981 240D ChinaBlue (Got her running with a donor engine.)
1983 300DTurbo w/sunroof.
1984 300TD manual sunroof. (Electrical Gremlins)