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 MANUALSAUDI199590 QUATTRO SPORT V6-2.8L (AAH)REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGCONTROL ASSEMBLYSERVICE AND REPAIRA/C CONTROL HEAD, REPLACEMENT
1995 Audi 90 Quattro Sport V6-2.8L (AAH)
A/C Control Head, Replacement
1995 Audi 90 Quattro Sport V6-2.8L (AAH)SECTION A/C Control Head, Replacement
- To switch from °C to °F or vice versa, press and hold down the recirculation button and at the same time press the temperature "+" button.
- If 71 °F (22 °C) is always displayed after switching the ignition on and off, regardless of last temperature setting, check voltage supply (terminal 30) to A/C control head -E87- according to wiring diagrams.
- Before removing A/C control head, check Diagnostic Trouble Code (DTC)memory for Automatic Climate Control. Testing and Inspection
- Switch ignition off.
- Carefully pry off trim plate -A-.
- Remove 2 screws -B-.
- Remove A/C control head from console.
- Press connector locking tabs (lower arrow) and remove connector from control head in direction indicated (upper arrow)
- Install in reverse order of removal.
After installing:
- Check A/C control head coding. Testing and Inspection
- Initiate "Basic Setting" function 04 for Automatic Climate Control. Testing and Inspection
- If 71 °F (22 °C) is always displayed after switching the ignition on and off, regardless of last temperature setting, check voltage supply (terminal 30) to A/C control head -E87- according to wiring diagrams.
- Before removing A/C control head, check Diagnostic Trouble Code (DTC)memory for Automatic Climate Control. Testing and Inspection
- Switch ignition off.
A/C Control Head and Trim Plate:
- Carefully pry off trim plate -A-.
- Remove 2 screws -B-.
- Remove A/C control head from console.
Connector:
- Press connector locking tabs (lower arrow) and remove connector from control head in direction indicated (upper arrow)
- Install in reverse order of removal.
After installing:
- Check A/C control head coding. Testing and Inspection
- Initiate "Basic Setting" function 04 for Automatic Climate Control. Testing and Inspection
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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.