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You have to determine if there is a leak bad cap or faulty thermostat. Start by checking all of the hoses for a leak and loose cap. The radiator cap can get bad and cause overheating. Thermostats are a very inexpensive item that will stick and cause it to not allow flow through the system. You also need to see if the fan is turning on if not then that can also be the cause of overheating. Let me know if you have any questions. Thanks Danny
Let me know if you need anything else if not please hit accept.. Thanks Danny
2003 Jetta left rear window blue plastic part of the