BMW 13621433077 Coolant Temperature Sensor

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Testing should be entrusted to a BMW dealer or suitably-equipped specialist. The radiator outlet thermostatic switch is located in the radiator lower hose and should only be removed when the engine and radiator are cold. Before removing the switch, disconnect the negative battery cable. Either drain the cooling system or use a suitable plug to prevent foreign matter from entering the radiator. Disconnect the electrical connector from the switch and release the retaining clip to remove the switch and sealing washer. Installation is the reverse of removal, using a new sealing washer. Refill the cooling system and start the engine to check the cooling fan. The coolant temperature sensor is located on the front side of the cylinder head. Remove the air intake duct and disconnect the wiring from the sensor. Unscrew the sensor unit from the cylinder head and apply sealant to the threads before installing the sensor. Reconnect the wiring connector and refill the cooling system. The coolant level sensor is mounted in the base of the coolant expansion tank. Disconnect the electrical connector and remove the retaining bolts to raise the coolant tank. Tilt the tank to access the sensor, rotate it counterclockwise, and pull it from the tank. Installation is the reverse of removal, and coolant may need to be added if necessary.

The radiator outlet switch is located in the radiator lower hose and should be tested and removed by a qualified repair shop. Before removing the switch, ensure that the engine and radiator are cold. Disconnect the battery cable and either drain the cooling system or use a suitable plug to prevent foreign matter from entering the radiator. Disconnect the wiring connector and remove the switch by releasing the retaining clip. Install a new sealing washer and refill the cooling system after installation. Start the engine and check that the cooling fan functions correctly. The coolant temperature sensor should also be tested and removed by a qualified repair shop. Partially drain the cooling system or use a suitable plug to prevent foreign matter from entering. The sensor is located on the left-hand side of the cylinder head, under the intake manifold. Disconnect the wiring and unscrew the sensor unit, recovering the sealing washer. Install a new sealing washer and securely tighten the sensor unit. Reconnect the wiring and refill the cooling system.