Description And Operation
Be certain to adjust the refrigerant system oil level when replacing an A/C compressor. Failure to properly adjust the refrigerant oil level can prevent the A/C system from operating as designed and can cause serious A/C compressor damage.
The external compressor controls are:
- Electrical connector for A/C clutch
- ECVD Valve
- A/C Line Ports
The compressor of the air conditioning system is the variable displacement type, with electric clutch engagement and external control of the displacement, via the External Control Variable Displacement (ECVD) valve. The compressors are specific for engine version and market.
The Heating, Ventilation, and Air Conditioning (HVAC) module manages the ECVD valve to increase or decrease the compressor displacement and thus the system pressure, via Pulse Width Modulation (PWM) control. External regulation of the displacement improves comfort, operation of the air conditioning system and saves the energy requested by the climate control system.
Only use R1234yf refrigerant and specific compressor oil for the climate control system compressor. Always or the Underhood label for the correct quantities. Refer to CAPACITIES AND RECOMMENDED FLUIDS, SPECIFICATIONS .