1995 Holden Statesman Heater

Just wondering if you would know why the heater would be just stuck on blowing on the floor. The climate control says its adjusted, but it blows only on floor. We have changed the climate control, under the dash we have change a heater control, and in the engine bay, near the fire wall, there is a heater part near the heater core, that has been replaced too.
Would you have any idea why its stuck on just blowing on floor.