I think this was discussed in the diesel performance tuning section recently and the concensus was that there isn't a whole lot of improvement in power or fuel economy from switching a fan/fan clutch to an electric fan. I don't think the auxillary fan would be capable of removing enough heat from the radiator. Its not shrouded and the fan is just to small.

Here is the link
Mechanical fan Vs Eletrical Fan For cooling system

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'83 300D 198,000mi Howard
'03 Saturn Vue CVT 75,000mi(wifeys)