A/C System Performance
WARNING: This page is about a different car, the 2002 Mercury Grand Marquis and 2002 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
- Park vehicle out of direct sunlight. Connect manifold gauge set to vehicle. Operate engine at 1500 RPM. Set A/C controls to recirculated air, panel (vent) mode, and MAX A/C.
- Set blower/fan to high speed. Close doors and windows. Insert thermometer into center vent. Operate system for 10-15 minutes to allow system to stabilize. Measure discharge air temperature.
- Ensure temperature at center vent is 33-47°F (0.6-8°C) and high side pressure is within specification. See A/C SYSTEM HIGH SIDE PRESSURE SPECIFICATIONS table. Low side pressure should remain constant at 25-45 psi (1.8-3.2 kg/cm2 ) throughout normal operating range.
A/C SYSTEM HIGH SIDE PRESSURE SPECIFICATIONS
| Ambient Temp. °F (°C) | Pressure psi (kg/cm2 ) |
|---|---|
| 60 (16) | 75-175 (5.3-12.3) |
| 70 (21) | 100-200 (7-14) |
| 80 (27) | 125-230 (8.8-16.2) |
| 90 (32) | 150-260 (10.5-18.3) |