1992 Chevrolet S10 Q&A

1992 Chevrolet S10 Question: A/C not flowing through the vents

I have replace all 3 switches in the control panel, the blower motor resistor on the firewall, have checked every vaccum hose that i can see. I only get air flow to the floor and the blower only works on high. How do i get the air to flow through the vents and should i replace the blower motor? -
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