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Faulty signal or faulty purge valve is most likely.
Wiki User
∙ 7y ago
There could be a few reasons why the air dryer on your semitruck is constantly releasing air. One possibility is that there is a leak in the air system that is causing the dryer to continuously purge air. Another reason could be that the air dryer is malfunctioning and not properly regulating the air pressure. It would be best to have a professional mechanic inspect and diagnose the issue.
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