I probably should have posted this info from the manual first
The cooling fans are mounted behind the radiator in the engine compartment. The electric cooling fans increase
the flow of air across the radiator fins and across the condenser on air condition (A/C)-equipped vehicles. This
helps to speed cooling when the vehicle is at idle or moving at low speeds.
The main fan size is 340 mm (13.4 in.) in diameter with five blades to aid the air flow through the radiator and
the condenser. An electric motor attached to the radiator support drives the fan.
A/C models have two fans-the main fan and the auxiliary fan. The auxiliary fan is 300 mm (11.8 in.) in
diameter. Non-A/C models have only the main fan.
A/C OFF or Non-A/C Model:
- The cooling fans are actuated by the Engine Control Module (ECM) using a low-speed cooling fan relay
and a high-speed cooling fan relay. On A/C-equipped vehicles, a series/parallel cooling fan relay is also
- The ECM will turn the cooling fans ON at low speed when the coolant temperature reaches 93 °C (199 °
F) and at high speed when the coolant temperature reaches 97 °C (207 °F).
- The ECM will change the cooling fans from high speed to low speed at 94 °C (201 °F) and will turn the
cooling fans OFF at 90 °C (194 °F).
- 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 113 °C (235 °F) and the
high side A/C pressure reaches 1,449 kPa (210 psi).