The blower wasn't working so I brought a new resistor and the Blower works now. The air and heat only comes out where the defrost is and at the bottom vent. Why doesn't it come out the vents on the dash board
I need more specific information about your vehicle like the year, size engine or any information that can help me diagnose the problem.
If the truck is an older version then check the vacuum hoses at the vacuum reservoir or any vacuum hose going into the fire wall going to the inside of the vehicle.
It could also be electronic, that's why I need more precise information.
Get back to me when you can.