Heater system will not blow hard from the dashboard vents.

What is your question?

If I turn on the A/C I can get full blast of air from the dash vents. When I switch to the heater I can barely feel air moving. The fan control bar increments up and I can hear the fan blowing harder and harder, but the amount of air from the vents is equal to the lowest setting. Same for all dash vents. I switch back to AC and I can feel that air easily from a foot away.