A/C System Performance
- Install manifold gauge set. Place a thermometer in the center vent outlet. Close all doors and windows. With engine at normal operating temperature, set engine to 1500 RPM. Depress AUTO switch. Set temperature to 65°F (18°C). Allow A/C output temperature to stabilize.
- Compare the ambient temperature to both high-side and low-side pressure readings. See A/C SYSTEM PERFORMANCE PRESSURES table. If pressure readings are as specified, system is okay. If pressure readings are not as specified, go to TEST NO. 20: REFRIGERANT SYSTEM .
A/C SYSTEM PERFORMANCE PRESSURES
| Ambient Temp. °F (°C) | High-Side Pressure psi (kg/cm2 ) | Low-Side Pressure psi (kg/cm2 ) |
|---|---|---|
| 68 (20) | 155-190 (10.9-13.4) | 13-23 (.9-1.6) |
| 77 (25) | 160-195 (11.2-13.7) | 15-25 (1.1-1.8) |
| 86 (30) | 185-225 (13.0-15.8) | 17-27 (1.2-1.9) |
| 95 (35) | 210-260 (14.8-18.3) | 18-32 (1.3-2.2) |
| 104 (40) | 250-300 (17.6-21.1) | 19-33 (1.4-2.3) |