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Hello, engine size?
sorry see it now, back shortly
ok, the high speed bypasses the blower resistor, so resistor is not the problem, The switch will not have power to it, it only makes grounds, so,, if you have power to one wire at the blower with key on and temp controls set and blower on, then 99.9% you have a bad blower, I would then set blower on high and begin tapping hard on the blower with hammer etc as it may be stuck, we do this in the shop as well, I lean to bad blower