2.2L & 2.4L Cavalier & SUNFIRE: Description

Cooling fan is controlled by Powertrain Control Module (PCM) through cooling fan relay based on inputs from engine coolant temperature sensor, intake air temperature sensor, A/C control switch, A/C refrigerant pressure sensor and Vehicle Speed Sensor (VSS). PCM controls cooling fan motor by grounding cooling fan relay control circuit which closes fan relay contacts.

Cooling fan relay is commanded on when:

• Engine coolant temperature reaches 223°F (106°C) or greater.
• A/C refrigerant pressure exceeds 190 psi.
• During extended idle conditions less than 5 MPH.
• After vehicle is shut off if engine coolant temperature at key-off is greater than 284°F (140°C) and system voltage is more than 12 volts. Fan will stay on for approximately 3 minutes.