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I'm having an issue where the a/c or heater blows through all vents no matter in what mode i put it in
 

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Either the A/C system leaked the freon out, bad compressor, etc, OR the blend door is not working.
My bet is on the switch and/or blend door, assuming the AC is cold and heater is hot. I has this problem on a previous car and a junkyard switch panel solved it.
 
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