is there one that could be blown or something as simple as that? It worked fine all winter for the heater but when I turned it on the other day for the a/c I discovered that it just don't work anymore. (relay or fuse) where could they be?
Is it the original Fan blower motor for your truck? If so, it's probably time to replace it. I just replaced mine a couple weeks ago. It worked okay during the winter, though noticeably weak. Then when the warm weather came it wouldn't blow at all. When I got it out I could barely move the motor shaft with my hand. That thing was just worn, rusted, and crusted. Not bad, for a 23+ year old motor. Also, my fuse panel below the drivers side dash uses one fuse for both heat and a/c. Mine was labeled from the factory. Yours might be in the same spot as well.