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Re: AC/Heater won't switch vents
Check for a loose or missing accessory vacuum which originates at the intake manifold. It loops by the firewall and around to the passenger side inner fender. You'll see a junction/coupler plastic connection next to the battery and engine compartment fuse box. Check it first. Look for any cracking along the complete plastic vacuum line. From there it inputs the main wiring harness and into the cabin to the HVAC system.
The HVAC vacuum actuators use engine vacuum for control via the climate control head unit.
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