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You need something.
While at speed, no fan is needed.
I'm a proponent for electric fans. More efficient, better for these engines where power is a prized commodity, and more modern.
I have my 190D set up so a 100* switch engages the engine driven electromagnetic fan clutch, and a 110* switch engages the aux fan. On BOTH fans I have a manual override switch to turn either one on and leave it on. Unless it is the middle of 110* summer in Tucson, I only need the engine fan to come on in bursts (when I'm sitting a lot).
I say install an electric puller fan with its on shroud on the engine side of the rad, and hook it up so the 100* switch turns it on. The aux fan will come on in an emergency and with the A/C on low speed by design.
Engine fans are antiquated and sap power.
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