A/C Amplifier
- Turn A/C on. Ensure A/C amplifier control functions 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 on 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 | |
|---|---|---|
| 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 | |