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One kicks on for normal cooling, they both kick on when the air conditioner is turned on.
The engine temperature must reach 232-235 degrees in order for the cooling fans to come on. They will shut off at about 195-200 degrees. Also when the air conditioner is on the cooling fans automatically come on regardless of temperature.
Whenever the AC is turned on, both cooling fans also come on. Otherwise, during normal operation only one fan comes on when activated to maintain correct engine temp.
It is probably your cooling fans. These are electric and may run with the engine turned off. It is probably your cooling fans. These are electric and may run with the engine turned off.
Check the thermal relay for the cooling fans.
Yes most models actually already come with a cooling fans.
coolant temp switch or fan relay are bad.
The 1999 Saturn S-Series engine heats up the coolant, the thermostat valve opens and the coolant circulates between the radiator and the engine. Then the radiator fans turn on to cool it back down. The fans are also turned on when the air conditioner is turned on to aid in cooling the radiator and the air conditioner condensor.
Most cases 235 degrees Fahrenheit In addition one or more of the cooling fans will come on and run continuously when the A/C is running.
The cooling fans on a 99 Nissan Maxima will not come on if the coolant temperature sensor is defective. The fan only comes on when the temperature passes a threshold.
In all probability it is the cooling fan switch. Before you replace it you need to check the fuses. The cooling fan switch is on the intake manifold.
The fans normally come on when needed. Is the car running hot -- is the temperature gauge reading above normal? If so, there's a problem with the fans or the cooling system. If not, don't worry about it.