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Schwarz - what you describe (cycling from 80-105-80C etc) is NOT NORMAL. You have a problem there that is not related to the VFC in ANY way. I'd replace your t-stat with a new Wahler or Behr, even if the current one is not that old. Also, most are rated 87C, not 82C... at least on the OM60x (and I thought the 617's were the same). You might even have a head gasket issue, which also causes erratic temps like this.
Everyone - alternator ratings are at peak output. A 70A unit puts out 35-40A max at idle. That's not enough to supply the car when idling in summer traffic. A 143-150A unit will put out 100A or more (!) at idle. Been there, tested that, complete data is in my alternator upgrade post elsewhere on this forum. I would never add a 25A load from an electric fan with the stock 70A (or smaller!) alternator.
Neil - what's the noise level, and cost, of the SPAL fan?
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