Cooling fan not working on 99 Volvo s70 replaced engine coolant sensor and relay still nothing fan only works when the engine colant sensor is unplugged?

If the cooling fan only operates when the engine coolant sensor is unplugged, it suggests that the sensor may still be faulty or that there is an issue with the wiring or connections related to the sensor. Check for any damaged wires or poor connections in the circuit. Additionally, ensure that the fan relay is functioning correctly and that there are no blown fuses. If the problem persists, consider testing the fan directly to rule out any issues with the fan motor itself.