A/C On

WARNING: This page is about a different car, the 2006 Suzuki Verona. However, it is still accessible from the selected car via links, so may be relevant.

The ECM will turn the cooling fans on at low speed when the A/C system is ON. The ECM will change to high speed when the coolant temperature reaches 115 °C (239 °F) or the high side A/C pressure reaches 1,859 kPa (270 psi).
The cooling fans will return to low speed when the coolant temperature reaches 112 °C (234 °F) and the high side A/C pressure reaches 1,449 kPa (210 psi).