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Broken water pump, or stuffed cooling system, or some valve not opening for heater. If its done around 100k i would go for cambelt and water pump change. It s a common fault on year 2000+ VW. Waterpump blades made of plastic and after around 80k usually it falling aparts.

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Q: Why does the heater not heatup after the blue light goes out on 2002 volkswagen beetle?
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