Audi A4 Owners & Service Manuals

Audi A4: Heating, Ventilation & Air Conditioning

Audi A4 (B9) 2016-2024 Service Manual / Heating, Ventilation & Air Conditioning


 Warnings when Working on Vehicles with High Voltage System

Vehicles with a High-Voltage System (Hybrid Vehicles) Working on Vehicles with High-Voltage System (Hybrid Vehicles) Extremely Dangerous Due to High-Voltage The high-voltage system is under high-volta

 A/C System, General Information


The purpose of this repair manual is to provide service advisors and technicians with the basic knowledge needed to ensure professional and competent procedures.   Note Only the careful study


 Refrigerant R134a Capacities, Refrigerant Oil and Approved Refrigerant Oils

Approved Refrigerant Oils and Capacities   Note As PAG (polyalkylene glycol) oil is highly hygroscopic (attracts water), opened containers are to be immediately resealed so as to be air-tight. PAG oil from containers which have been open for a lengthy period is no longer usable. Refrige

 Exhaust System, Emissions Controls

Exhaust Pipes/Mufflers Overview - Muffler Overview - Muffler, FWD Vehicle 1 - Retaining Loop Replace if damaged Exhaust system, installing without tension. Refer to → Chapter "Exhaust System, Installing without Tension". 2 - Bolt 23 Nm 3 - Bracket 4 

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