the black relay box under the hood on the passenger side. next to the windshield wiper fluid
fan control relay
P1491 Radiator Fan Control Relay Circuit An open or shorted condition detected in the radiator fan control relay control circuit. This includes PWM solid state relays.
The engine computer uses the signal from the coolant temperature sensor to decide when to activate the radiator fan relay.
P1491 - Radiator Fan Control Relay Circuit
a bad fan control relay
If you mean the radiator fan make sure the airconditioning is off. If the fan keeps running it could be a bad fanswitch (located on radiator tank. Or a failed control relay (if fitted) If still no luck check for a failed AC fan control relay.
Check radiator fan control relay.
Radiator fan relay control circuit
Yes. Cooling fan, engine fan, and radiator fan relays are all the same thing.
When the radiator fan relay fails on a vehicle, it can quickly overheat due to the lack of cooling. The fan is designed to kick on at specific temperatures controlled by the relay.
The 2004 Jeep Liberty radiator fan relay switch can be found on the back of the fan motor. The relay switch is attached directly to the fan motor.
The fan relay and its fuse are on the radiator support bracket on the right side of the car.