I just had the engine out of my truck, but now the a/c won't blow out of the floor or face vents, just the defrost vents. The switch still works because it will cut off, but it doesn't matter if I put it on the face vent option or whatever, it still blows out of the defrost. I guess I've messed up the little diverter that sends the air in different directions, anyone know how to get to it and fix it? Thanks

 

When you put the motor back in you forgot to hook up the vacuum line for the heater control. The heater defaults to defrost so your windows will keep clear. Should be a vacuum line coming out of the firewall that needs to be hooked up to the vacuum pump.