If the rest of the cooling system is good it sounds like the fans located right behind the radiator might solve the problem.
I run Red Line's "Water Wetter" in my 1.6TD Jetta and Mercedes 180D, just water and additive in the summer then coolant and additive in the winter. I'm not a big additive user but I swear this stuff works. Both those engines are a little worn out and it does keep them cooler.
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J.D. in Reno
1958 Mercedes 180D (rebuilding now)
1985 VW Jetta 1.6TD
1985 Volvo 745 Wagon 2.4TD (sold but still maintain it)
1987 VW Quantum Syncro 2.2 (converting to 2.0TD)
1996 TDI Passat
1997 Chevy 3/4 ton 6.5TD
2006 V10 TDI Touareg
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