Diagnosing radiator issues starts with checking for leaks, low coolant levels, or overheating. Inspect hoses for cracks, ensure the radiator cap seals properly, and look for rust or blockages. Test the thermostat and cooling fans for proper function. If the engine runs hot, a clogged or failing radiator may be the cause. Seek professional help if needed.

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The engine control unit or ECU relies on a number of sensors to regulate different aspects of engine operation. One of those sensors is the coolant temperature sensor or CTS. Make sure your Volkswagen's CTS is in good working condition.

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