I have 27K miles on a Graf with no complaints.
Update: Water pump replaced on Friday and new pump is quiet like the original so problem seems to be solved. Only conclusion is the 1st replacement must have been a factory defect and even though it was working, the noise definitely didnt give me long term confidence.
Great if taken care of!
I have a 2016 Golf 5MT, 160k mi now. It's been tuned for 120k and only major issue I've had is the original water pump went out last spring at approx. 140k.
It was the water pump
Waterpump. There's no way to visually inspect the WP without removing it.. Which would basically be a timing belt job. Pull the pump, I bet it's missing plastic.
Generally the OEM plastic water pump only lasts as long as the timing belt interval. I wouldn't rule it out since the overflow water you might be seeing could just be water which is expanding or boiling as you increase the engine speed.
The water pumps are plastic. Heat and plastic don’t go well together. My MK6 has had at least 3 water pumps and sitting at 120k.
The tech noticed the water pump was leaking slightly. All got repaired under VW warranty which was lucky as it was around £1800 otherwise I think. Anyway, the weird thing is the car always lost coolant from new - it would drop to the min level, but they couldn't find a fault when I mentioned it until they physically found the water pump leaking after 4 years and 40k miles. I think the pump is plastic which may not be ideal.
Mine failed in my 2015 Golf after 11,000km.
My 2016 Mk7 GTI is on its 4th water pump/thermostat housing. The first replacement happened at about 27K miles, the second failed at 63K miles, and the third failed at 72K miles. I fully expect this one to leak again soon. I find it ridiculous that VW/Audi don't fix a faulty part after all these years. The plastic thermostat housing is to blame. Instead of a metal housing which can handle the thermal stresses, they continue to use a plastic housing which will start leaking sooner or later.
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