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 MANUALSAUDI1998A4 AVANT QUATTRO, AUTOMATICREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-HEATER SYSTEMTESTINGA/C SYSTEM PERFORMANCE
1998 Audi A4 Avant Quattro, Automatic
A/C System Performance
1998 Audi A4 Avant Quattro, AutomaticSECTION A/C System Performance
- Check for any Diagnostic Trouble Codes (DTCs) which may be present, and repair as necessary. See SELF-DIAGNOSTICS . Perform basic setting and A/C-heater control panel coding checks. See procedures in SELF-DIAGNOSTICS .
- Park vehicle out of direct sunlight. Ensure condenser and radiator are free of obstructions. Close engine hood. Ensure compressor drive belt and generator are in good condition. Ensure engine is at normal operating temperature. Close doors, windows, and sun roof. Record ambient temperature.
- Start engine and run it at 2000 RPM. Turn A/C system on and press recirculation button on. Set A/C-heater control panel to maximum cold position (ice crystal symbol should glow). Open all instrument panel air outlets. Run fresh air blower at maximum speed. Set air distribution so that air flows out of instrument panel vents.
- Check outlet air temperature at center instrument panel vent after the A/C system has run for at least 5 minutes. See A/C SYSTEM PERFORMANCE SPECIFICATIONS .
A/C SYSTEM PERFORMANCE SPECIFICATIONS
| Ambient Temp °F (°C) | Outlet Air Temp °F (°C) |
|---|---|
| 59 (15) | 37-43 (3-6) |
| 68 (20) | 37-43 (3-6) |
| 77 (25) | 37-43 (3-6) |
| 86 (30) | 37-43 (3-6) |
| 95 (35) | 39-45 (4-7) |
| 104 (40) | 41-46 (5-8) |
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.