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Hello all... The compressor kicks on.... there is plenty of freon. The ac line from the engine is cold... but all i get is hot air from the inside vents. I peeked in the center vents with a flashlight... the plate that allows the ac to enter the cabin is closed. i pushed it open with a pen a bit and cold air came through, but as i let go... the plate closed again. any ideas?
 

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What year do you have?
 

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I'm having a similar problem in my 1980 300SD turbo, but only the driver side vent is ever open, but blows nice and cold, the center ones were working, but until recently they stopped blowing, any ideas?
 

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you have a vacuum leak somewhere in the system.
 
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