Yeah...In the South the resistor bridge works well....
Some guys also use a toggle/cabin sw across the low fan sw too...that way you have a manually controlled fan anytime you want it...guys that tow boats or do a lot of traffic jams and stuff use that ...either one only costs a couple of bucks..

As far as your 107 condition, you fail in your post to mention if the low fans are coming on w/ac..that is the point I was making.

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A Dalton