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Home >> Audi >> 2021 >> A4 Quattro Premium Plus, 2.0L Eng VIN B >> Repair and Diagnosis >> General Information >> Heating, Ventilation & A/C (HVAC) >> Map - Heating, Ventilation, & Air Conditioning >> Heating, Ventilation & Air Conditioning Systems >> Vacuum Tubes

Vacuum Tubes

Condition Code Procedure
Disconnected A Require repair
Melted A Require repair or replacement
Missing C Require replacement
Oil-soaked (spongy) 1 Suggest replacement
Restricted A Require repair or replacement
Routing incorrect B Require repair
Surface cracks (dry-rotted) 1 Suggest replacement
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