Components of the radiator fan: 1 - four-blade fan for Bosch engine (5); 2 - thermal switch; 3 - fan for AEG engine (4)
At a certain temperature, the switch contact closes the radiator fan current circuit. The fan starts to operate.
Be careful when working on the engine: if it is hot, the fan may suddenly start!
Various connection options
The following connection options are available for the radiator fan, as shown in the table.
Note: From August 1978 onwards, a different thermostatic switch for the radiator fan is used. This thermostatic switch is screwed into the thermostat housing. For identification purposes, the switch installed from August 1978 onwards is designated 90/95. It must not be installed in older diesel Golf models.
On the left side of the radiator (1) is the thermal switch (2) of the radiator fan. If the switch fails, which happens in older cars, pull out both connectors (3 and 4) and insert both contacts into each other. If your car has a dual plug on the thermal switch, the contacts are connected with a piece of wire
If someone wants to check without much expense whether the radiator fan works (when the engine is hot), it should work as follows: let the warm engine idle, watch the temperature readings. The fan should start working before the pointer moves all the way to the right or the indicator light comes on, otherwise the thermal switch in the radiator is faulty.
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