Minimum Compressor on Time

Vehicles operating above 32 km/h (20 mph) will be controlled to a minimum ON time of 4-6 seconds before the DIM will allow the clutch to disengage. After a minimum ON time has expired, the DIM will request the PCM to disengage the A/C compressor clutch only if the low side temperature is below -2°C (28°F). After reaching this turn off temperature, the DIM waits for the low side to reach a turn-on temperature of 10°C (50°F) and then repeats the cycle. During the compressor ON cycle, any of the following conditions will force the PCM to disengage the A/C compressor clutch:
^ Low battery voltage.
^ A/C refrigerant pressure sensor detects a low or high pressure condition.
^ Coolant temperatures above 152°C (305°F).

Except for Wide Open Throttle (WOT), all of these conditions will keep the compressor OFF until the condition no longer exists. The WOT condition will keep the compressor OFF for a maximum of 20 seconds. On initial crank, the DIM will check for indications of liquid refrigerant which may have collected at the compressor. If found, the A/C compressor clutch will engage. After the engine has started, the clutch will disengage waits for normal conditions to activate the clutch. If the conditions are not met for activating the compressor, a SERVICE A/C SYSTEM message will appear on the driver information center.