I had a bad heater core and blower motor, replaced them. Tried using the heater and I can hear the blower motor turn on and increase/decrease with the controls, yet there is not air of any kind coming out of any of the vents. I checked the vacuum hose in the engine bay and it has vacuum. It’s getting cold now and I need the heater.
I don’t know if the vents work prior to the heater core/blower motor.
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