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The fan motor and resistor location can vary depending on the supplier of the dash system ; what is consistent is the resistor ( because it gets HOT ) is located in the air flow duct from the fan for cooling, as mentioned within inches .
Mine is under the dash at the passenger's feet .
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.