2001 Buick Regal How to fix heater contol air flow?

Clicking on the electrical relay switch when I make a change in the way airflow (windshield, floor, dashboard), but no air flow to change direction. Only partial flow is maintained at all vents. The fan and control the fan speed is working well. The fuses are all good.

The relay that controls the flow of air running on empty engine. Check the relay in the dashboard on the passenger side to make sure that all tubes are connected, without interruption. Trace the vacuum tube to make sure that is the match well, as needed. Is likely to lead off the firewall in the engine compartment on the passenger side, travel on the steering wheel and past the battery to where it crosses the engine is connected to the intake manifold.

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