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No air coming through vents

Nothing comes out of the vents on any setting, heat, air, defrost etc unless I’m doing about 50mph and then it’s only slight (no fan). I replaced blower motor today and nothing happened.

But it does appear that after I’ve driven the suburban for about 30 minutes it starts to work slightly.

There are several possibilities including a defective switch or wire to the fan. It is difficult to hook up the volt meter from here, but most any mechanic should be able to fix this one. It just some basic investigation work.

Is this one of those fancy jobs that you set a temperature for the driver another for the passenger etc. or a basic system?