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In a situation like this, sometimes the only course of action is to pull the fuse and see what doesn't work.
Although the third picture, if your dash HVAC is a Denso product is the inline for the dash control .
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.