Ok here it goes lol. I have a 1976 C10. The truck came with A/C. The PO did an engine swap. The engine he swapped in does not have A/C. I can not get the fan/heater to blow anything. I can hear it click under the dash somewhere but that is all it does. I know going down the road, she has warm air coming out of the vents. I assume that is because the system doesn't turn "Off". Basically I want to know if there is a easy way to test the motor, or if the no A/C could be causing my problems. I have been trying to find a wiring diagram of the A/C or heater system for under the dash/under hood. The Fuse is good. The switch on the dash that controls the fan speed, is broken and someone has a scew in it to make it flipable. Thanks for any advice. I can gladly post pics or anything else I need to help get this thing going. Also I am not going to put A/C back in the truck, so what I can I do to delete all the A/C componets/wiring left in the truck. The condenser and all is still in the truck.