Coolant circulation pump

An additional electrically controlled coolant pump is included in the coolant circuit, which is connected via hoses to various parts of the cooling system. This pump is constantly on and also controls the radiator fan monitoring, so a hot engine can cool down for a while even after the ignition is turned off.

The functioning of the pump and, as a result, the monitoring of the fan can be monitored without any difficulty if any problems occur in this place. With this control, you must turn off the ignition.

Disconnect the four-pin sensor connector from the thermostat housing.



Connect with connecting wire brown-red (D) and brown (IN) cable.

Check that the radiator fan and continuous water pump are running.

If this does not work, then there are some other problems that can be detected and eliminated in the firm's workshop «Volkswagen» when using test equipment.