A/C System Performance
- Park vehicle out of direct sunlight. Ambient air and in-car sensor temperature readings must be greater than 70°F (21°C). Connect a tachometer and compressor manifold gauge set to vehicle. Attach a thermocouple to evaporator line. Start and run engine at 1000 RPM with A/C turned off and transmission in Park, until radiator fan comes on. Allow engine to idle.
- Close all vehicle doors and windows. Turn blower control selector fully clockwise, to high position. Set temperature to low position. Push panel mode button. Push recirculated air button. Ensure MANUAL is displayed on function display and A/C (snowflake) and recirculation symbols are also displayed.
- Hold engine speed at 1000 RPM and ensure compressor clutch is engaged. Insert thermometer into left center A/C outlet and operate engine for 5 minutes. Compressor clutch may cycle depending on ambient air temperature.
- When compressor clutch is engaged, compare discharged air temperature and A/C system pressure with specified temperature and pressures. See A/C SYSTEM PERFORMANCE TEMPERATURE SPECIFICATIONS and A/C SYSTEM PERFORMANCE PRESSURE SPECIFICATIONS tables. System is okay if temperature and system pressures are as specified.
A/C SYSTEM PERFORMANCE TEMPERATURE SPECIFICATIONS
| Ambient Temp. - °F (°C) | Outlet Vent Temp. - °F (°C) |
|---|---|
| 70 (21.1) | 42 (5.6) |
| 80 (26.7) | 45 (7.2) |
| 90 (32.2) | 50 (10.0) |
| 100 (37.8) | 54 (12.2) |
| 110 (43.3) | 59 (15.0) |
A/C SYSTEM PERFORMANCE PRESSURE SPECIFICATIONS
| Outlet Vent Temp. - °F (°C) | High Side - psi (kg/cm2 ) | Low Side -psi (kg/cm2 ) |
|---|---|---|
| 42 (5.6) | 200-230 (14.1-16.2) | 15-25 (1.1-1.8) |
| 45 (7.2) | 210-250 (14.8-17.6) | 20-30 (1.4-2.1) |
| 50 (10.0) | 240-280 (16.9-19.7) | 25-35 (1.8-2.5) |
| 54 (12.2) | 280-320 (19.7-22.5) | 30-40 (2.1-2.8) |
| 59 (15.0) | 320-365 (22.5-25.7) | 35-45 (2.5-3.2) |