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.
A/C refrigerant system, checking pressures: Checking: Notes
1996 Audi A4 Base, StandardSECTION Notes
WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2005 Audi allroad, 2004 Audi allroad, 2004 Audi A6, 2003 Audi allroad, and 2003 Audi S6. However, it is still accessible from the selected car via links, so may be relevant.
- Switch ignition off.
- Connect high pressure hose of refrigerant recovery/recycling/recharging unit Kent-Moore ACR4 , or equivalent, to high pressure service connection. See A/C SYSTEM, QUICK COUPLING CONNECTIONS .
- Leave low pressure hose of refrigerant recovery/recycling/recharging unit disconnected.
NOTE:
Only the high pressure service valve is used for A/C system servicing. Perform all A/C system service operations (i.e. discharging, evacuating and charging) through the high pressure service valve only.
TEMPERATURE AND REFRIGERANT SYSTEM PRESSURE
| Outside (ambient) temperature((1)) | Base pressure in refrigerant system (engine OFF) | ||
|---|---|---|---|
| +15°C (59°F) | 3.9 bar (56.5 psi) | ||
| +20°C (68°F) | 4.7 bar (68.2 psi) | ||
| +25°C (77°F) | 5.6 bar (81 .2 psi) | ||
| +30°C (86°F) | 6.7 bar (97.2 psi) | ||
| +35°C (95°F) | 7.8 bar (11 3.1 psi) | ||
| +40°C (104°F) | 9.1 bar (132.0 psi) | ||
| +45°C (113°F) | 10.5 bar (152.3 psi) | ||
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RENDER: 1.0x
NO RELATED
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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.