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Originally Posted by gsxr
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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Many of the High output alternators put out less at Idle than a lower rated one.
You can't assume they all put a lot out off idle.
I had guy I wanted to buy a new alternator for my truck...I haigh amp one from...he talked to me about what I needed it for etc....most of which was to run an inverter at idle for extended periods....and he told me as much as he would love a sale that was the wrong choice for my needs. And that my stock 75 amp one actually put more out at idle than this one did.
This was for occaisonal power tool use in remote places...and as an emergency generator to keep refridgerator going on the rare times an ice storm takes down comercial power.......normally power is very quickly restored even after bad ice storms do to my location on the grid. adn a stand alone generator makes little sense as a result. A 2,500 watt average Inverter will be sufficient for the little needs I had. I ran a smaller one off my bense 2 years ago for a tv adn light..but was too small to handle the surge of the refridgerator startup.
Actually that one was a Computer UPS I pulled the battery out of cabled to my battery in car and forced it to run like a comercial puwer outage adn ran an extension cord into house. It wasn't a dedicated inverter. I was the only person on the street with a tv that worked that day.