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Old 08-25-2020, 01:18 PM
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Join Date: Nov 2006
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Air conditioning air blowing out defroster vents, 1984 300CD

So, the A/C works great. But, the air is coming out mostly from the defrost vents at the base of the windshield. It does come out ok at the dash side vents. But, there is NO air coming out the 2 center dash vents. What would fix this?

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Old 08-25-2020, 01:20 PM
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Join Date: May 2016
Posts: 6,025
Sounds like vacuum issues. Vacuum is required to close the defrost vent and to open the center vent. Check to make sure the vacuum line coming into the cabin isn't unplugged in the engine compartment.

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