Cooling Fans

This two fan system is PCM controlled by inputs received from the engine coolant temperature sensor, vehicle speed sensor, and the A/C system. The PCM commands the primary cooling fan On when engine coolant temperature exceeds 225° F, A/C head pressure is above 225 psi and when certain diagnostic trouble codes are set. The primary fan is commanded Off when engine coolant temperature drops below 217° F, or A/C head pressure drops below 180 psi.

The secondary cooling fan is commanded On when the engine coolant temperature exceeds 232° F, A/C head pressure is above 248 psi or certain diagnostic trouble codes are set. The PCM commands the secondary fan Off when engine coolant temperature drops below 224° F, or A/C head pressure drops below 203 psi.