Diagnostic Aids

WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.

In order for the A/C compressor clutch to engage, several conditions are required as follows:

Defrost mode is selected or the A/C switch is depressed.
Battery voltage is between 9 - 18 V.
Engine coolant temperature is less than 124°C (255°F).
Engine speed is greater than 600 RPM.
Engine speed is less than 5, 500 RPM.
A/C high side pressure is between 269 - 2, 929 kPa (39 - 425 PSI).
Throttle position is less than 100%.
Evaporator temperature is greater than 3°C (38°F).
ECM does not detect excessive torque load.
ECM does not detect insufficient idle quality.
The ambient temperature is above 1°C (34°F).
Blower motor must be in any other position than off.
A/C switch is depressed.