A/C Amplifier
- Ensure A/C amplifier control functions, with A/C on, are as follows: idle speed increase (if equipped with vacuum switching valve), A/C compressor clutch operation is delayed 0.8 of a second after vacuum switching valve is on or outputting A/C on signal to Engine Control Module (ECM).
- The A/C system operation should be as indicated in A/C AMPLIFIER TESTING table. The A/C system should be off while cranking engine. The A/C system should come off within 10 seconds of full throttle opening (90 percent open).
NOTE:
Additional A/C amplifier testing is not available from manufacturer.
A/C AMPLIFIER TESTING
| Condition | A/C System Operation | ||
|---|---|---|---|
| R-12 Pressures | |||
| High Side | |||
| Above 383 psi (27.0 kg/cm2 ) | Off | ||
| Below 299 psi (21.0 kg/cm2 ) | On | ||
| Low Side | |||
| Below 29.9 psi (2.1 kg/cm2 ) | Off | ||
| Above 34.1 psi (2.4 kg/cm2 ) | On | ||
| R-134a Pressures | |||
| High Side | |||
| Above 455 psi (32.0 kg/cm2 ) | Off | ||
| Below 370 psi (26.0 kg/cm2 ) | On | ||
| Low Side | |||
| Below 28.4 psi (2.0 kg/cm2 ) | Off | ||
| Above 37.0 psi (2.6 kg/cm2 ) | On | ||
| Engine Coolant Temperature | |||
| Above 230°F (110°C) | Off | ||
| Below 217°F (103°C) | On | ||
| Evaporator Temperature | |||
| Below 34°F (1°C) | Off | ||
| Above 35°F (2°C) | On | ||