Engine Cooling Fan: Operation
High speed cooling fan is left fan (fan No. 2) and low speed cooling fan is right fan (fan No. 1). Powertrain Control Module (PCM) will energize low speed fan when engine coolant temperature exceeds 212°F (100°C) or when A/C is requested.
Left cooling fan will run at a higher speed when high speed fan is requested. Cooling fan will continue to run approximately 45 seconds after A/C request signal is gone.
When low speed cooling fan is energized, PCM will delay high speed cooling fan for approximately 6 seconds. When A/C refrigerant pressure exceeds 210 psi (15 kg/cm2 ), PCM will energize high speed cooling fan. PCM will also energize high speed cooling fan when engine coolant temperature exceeds 226°F (108°C).