The engine «boils» — a faulty radiator fan (Focus Turnier 1)

Your Focus's cooling system copes equally well with long idling periods and stressful mountain-climbing drives. If, however, the temperature rises to the boiling point, the radiator fan may be on strike. Don't tow your car right away (see PCM overheating program): let the engine cool down, and drive gently to the nearest workshop. Although you should avoid idling and slow driving in high gears if possible, your supposed caution unnecessarily heats the engine - too little air flows through the radiator.

Be careful: if the warm engine has just been turned off, never keep your hands near the fan! The fan can suddenly start even when the ignition is off.

First aid - close the thermal switch

Check the fan fuse first.

In the second step, disconnect the multi-pin connector from the thermal switch.

Close the contact that supplies voltage to the ground contact in the connector. This will eliminate the thermal switch from the electrical circuit. If the fan turns on, the thermal switch is faulty. If it does not work, then either the conductivity in the supply wire is broken, or the fan itself is faulty.

Before the final repair, clamp the jumper wire well. And to prevent the clamped wire from getting under the fan blades, fix its end with adhesive tape in a suitable place.