A/C System Performance
WARNING: This page is about a different car, the 1999 Mazda B4000, 1999 Mazda B3000, and 1999 Mazda B2500. However, it is still accessible from the selected car via links, so may be relevant.
- Park vehicle out of direct sunlight. Install A/C manifold gauge set. Start engine and allow it to reach normal operating temperature. Raise engine speed to 1500 RPM. Set A/C controls for MAX A/C, panel vent outlet mode, and full cold settings.
- Set blower switch on maximum speed. Set air selector to recirculation setting. Close all doors and windows. Insert thermometer in center vent. Operate system for 10-15 minutes to allow system to stabilize. Measure center vent output temperature. See A/C SYSTEM PERFORMANCE SPECIFICATIONS table.
- Temperature should be 35-50°F (1.7-10.0°C) at center vent with high-side and low-side pressures 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 PERFORMANCE SPECIFICATIONS
| Ambient Temperature °F (°C) | Outlet Air Temperature °F (°C) |
|---|---|
| 60 (16) | 34-47 (1.1-8.3) |
| 70 (21) | 34-47 (1.1-8.3) |
| 80 (27) | 34-47 (1.1-8.3) |
| 90 (32) | 34-47 (1.1-8.3) |
| 100 (38) | 41-52 (5.0-11.1) |
A/C SYSTEM HIGH-SIDE PRESSURE SPECIFICATIONS
| Ambient Temperature °F (°C)) | psi (kg/cm2 ) |
|---|---|
| 60 (16) | 75-175 (5.3-12.3) |
| 70 (21) | 100-200 (7.0-14.0) |
| 80 (27) | 125-230 (8.8-16.2) |
| 90 (32) | 150-260 (10.5-18.3) |
| 100 (38) | 180-320 (12.7-22.5) |