Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI1998A8 SEDAN (4D2) V8-3.7L (AEW)REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGCOMPRESSOR HVACDESCRIPTION AND OPERATION
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)
Compressor HVAC: Description and Operation
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION Description and Operation
A/C Refrigerant System, Component Overview
A/C compressor
The compressor is driven via a belt on the engine when the A/C clutch engages (A/C ON).
Low pressure refrigerant gas from the evaporator is compressed by the compressor. After compression, the refrigerant gas (now high pressure) flows to the condenser.
The variable displacement A/C compressor varies piston stroke and output depending on load requirements and suction pressure.
NOTE:
- The compressor contains PAG type refrigerant oil that is mixable under all temperatures with refrigerant R-134a.
- A label on the compressor indicates that compressor is for R-134a systems only.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.