GM Service Manual Online
For 1990-2009 cars only

Problem

Action

The purge control line exhibits one of following conditions:

    â€¢ Broken
    â€¢ Kinked
    â€¢ Frozen
    â€¢ Plugged
    â€¢ Disconnected

Determine if the air flows through the purge control line when the air compressor is unloaded.

The air brake dryer purge valve is faulty.

Replace the purge valve.