How about with the A/C on max. Both fans should come on in low speed. Normally the fans do not turn on in normal operation until the engine temperature reaches around 225 degrees.
With engine off disconnect the engine coolant temperature sensor (ECT) and start it up. After a short period of time both fans should turn on.
The thermostat and ECT are possibilities to include maybe the cooling fan relays with are controlled by the powertarin control module (PCM) based on engine temperature.