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HVAC control unit

 
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Old 06 Jul 2017, 02:59 am
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Default HVAC control unit

After I've changed the heater core and totally cleaned out the car I'm putting it back together again but can't stop wondering what this vacuum gadget (red ring) on the HVAC control panel is used for, does anybody know?
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Old 06 Jul 2017, 06:45 am
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Default Re: HVAC control unit

I'm not positive, ed, but I THINK they control the blend doors to direct the air flow to the dash/floor/defrost.
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Old 06 Jul 2017, 10:30 am
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Default Re: HVAC control unit

It's a vacuum actuated control that moves the door which allows you to choose between air coming into the cabin from outside,,or air recirculating within the cabin.
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