warm air from vents
the reason why your air is so warm is probably because it has to go down past the firewall, WHICH IS WARM. the fan in my car is right behind the exhaust header on the ENGINE side of the firewall!! But i don't have to turn the fan on to get warm air in winter. i just turn the heat control up and let the warm air circulate through the car naturally. If you want to get cooler air maybe you could fab a heat shield for your firewall/fan area to cool things down, or maybe put your fan under/ behind the glove box like some other trucks. Maybe you could post pics of fan area. the intake for the fan is usually by the wipers so it would probably help to install heat shield.
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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