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Q: I recently replaced the battery and now the A/C only blows hot air. Any ideas? on 2006 Volkswagen Passat

A/C worked fine before. Now its constant hot air when A/C is on.
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the a/c realy may be part of the a/c control module per all data,or the a/c control module just lost its memory. i suggest you seek help on this as to not cause further issues.when changing a battery in the newer cars you must keeep memory alive using a pwr box as to not cause other issues. sorry but it could be several things. you can try
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