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Cooling system malfunctions (VW Golf 4)

CAUSE	METHOD OF ELIMINATION
The coolant temperature is very high. The control lamp on the instrument cluster is on
Not enough coolant in the cooling system	Check and, if necessary, top up the coolant level. If there is constant loss of coolant, determine and eliminate the cause of the coolant leak
The thermostat does not open	Check if the cooling system hoses connected to the radiator are hot. If the hoses are cold, remove them, check for proper operation and, if necessary, replace the thermostat. Alternatively, remove the thermostat. This will allow the engine to warm up to normal operating temperature for a longer time
The outer surface of the radiator is dirty	Blow out the radiator with compressed air from the engine compartment
Reduced radiator flow due to limescale or rust deposits on the inner surface of the radiator	Replace the radiator
The radiator fan is not working	On an electric fan, check that the electrical connectors are securely connected to the temperature sensor and the fan motor. Check the radiator fan motor for proper operation by disconnecting the electrical connector from the temperature sensor and short-circuiting the connector contacts. When the ignition is on, the radiator fan should operate. Otherwise, replace the radiator fan motor
The valve in the expansion tank cap is faulty	Check the valve under pressure
Coolant temperature gauge is faulty	Check the coolant temperature gauge and sensor for proper operation
The water pump is not working	Replace the water pump drive belt

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The text has been checked: Kolesnikov Artem

Previous articles
Cooling system hoses
Removal and installation a water pump on a diesel engine
Removal and installation a water pump on a 5-cylinder gasoline engine
Removal and installation a water pump on a 4-cylinder gasoline engine
Installing the radiator and fan
Removal the radiator and fan

Next articles

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