A/C refrigerant system, checking pressures: Checking
WARNING: This page is about a different car, the 2004 Audi S4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. 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 DISCHARGING .
- - 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.
OUTSIDE TEMPERATURE VERSUS A/C REFRIGERANT PRESSURES
| 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 (113.1 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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