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Arthur,
What resistance value did you wind up using and what was the cut-in temperature that it worked at? It appears that you are validating this approach yes? I certainly don't want to "bring the fans on earlier than normal temps" but just want to make sure it doesn't go much farther than that first line above 80 degrees (what the heck is that anyway - 100 deg?). I have watched the needle creep up in traffic in the summer and it went maybe an eighth of the way to 120 before the fans kicked in and cooled it all the way down to 85.
re: Film resistors - I have seen references to thin, thick, metal, carbon film. Which one and what wattage?
On your other point - you are using the low speed circuit as a manual override? Is it effective or is it now redundant in stop and go situations? I myself am in favor of redundant / failsafe mechanisms and have been thinking about adding such a modification.
Cheers
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