Air Conditioning: Compressor

The following changes have been introduced by comparison with the compressor on the S70/V70:

• The same basic concept as the compressor but a larger cylinder displacement, 167 cm³ higher capacity.
• Maximum acceleration compressor disengagement for at least 10 seconds but a maximum of 20 seconds.

The starting process for the air conditioning compressor 

If the engine coolant temperature (ECT) is warmer than -7°C, the air conditioning relay is controlled by the engine control module (ECM). This is so that the compressor engages every time the car is started. The compressor is engaged during the start process in exactly the same way as when the air conditioning (A/C) is selected.

• Engagement occurs during the starting process regardless or not of whether the air conditioning (A/C) is selected or not.
• Engagement continues for 100 engine revolutions. The compressor is then disengaged.
• If the air conditioning (A/C) is selected, the compressor continues to be driven.

The starter motor has a lower engine speed (RPM) than the car engine. As a result, the pressure in the compressor is not as high. The risk of the safety valve being activated is eliminated and any liquefied refrigerant is driven out of the compressor.