Audi 80 Quiz
Heating and Ventilation

Air Conditioning

In this manual: Heating and Ventilation
Technical Description — 39Engines — 41Exhaust System — 13Cooling System — 28Fuel tank and fuel pump — 12Air Filter and Intake Ducts — 13Mono-Motronic Injection System — 18Digifant Injection System — 19KE-III-Jetronic Injection System — 35MPI and MPFI Injection Systems — 32Clutch — 11Transmission and Driveline — 21Suspension and Steering — 33Brake System — 41Anti-lock brake system — 8Wheels and Tires — 13Body Electrical System — 35Ignition System — 24Lighting — 14Signaling Devices — 7Instruments and Auxiliary Equipment — 54Heating and Ventilation — 7Body Components — 18Troubleshooting — 6Specifications — 13
~1min read

Gaseous refrigerant is compressed by the compressor in much the same way as in a household refrigerator. The compressor is driven by the engine crankshaft via a V-belt. Under compression, the refrigerant becomes liquid and enters the evaporator (radiator). Inside, the refrigerant evaporates and thereby absorbs heat. Air passing through the evaporator enters the cabin cooled. The refrigerant returns to the compressor via the condenser located next to the engine coolant radiator in the engine compartment. To increase condensation, the cooling fan continuously blows air through the condenser.


V-Belt or Poly-V Belt
For reliable operation, the air conditioning compressor V-belt must be properly tensioned. On models with a 6-cylinder engine, a poly-V belt with an automatic tensioner is used instead of a V-belt. For more details on belt drives, see the Generator section.

Note: Repairing the air conditioning system at home – except for checking the V-belt – is not possible. Not every workshop can repair such systems, even Audi workshops. Therefore, in case of faults, first verify that the staff have the appropriate qualifications, and only contact such workshops.

Test yourself

A quick Audi 80 quiz: every answer comes with an explanation and a link to the manual page.