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Okay...I have identified this problem in two previous complaints. Now, a month after getting both the auxiliary and main water pumps replaced on my 2010 VW passat (2.0T, 6-sp auto), this car is back at my mechanic with the main water pump failed yet once again. The issue is one of engineering. VW put a plastic water pump(s) onto the engine with an o-ring to seal it. If ANY oil drips onto the pump, it leaks into the o-ring cavity and interacts with the material of the o-ring, causing it to swell and crack the pump casing. Apparently right after getting the last water pump replaced I had the oil changed and they spilled a little oil. That's all it took. VW needs to look at using an o-ring that doesn't swell when oil touches it. Or stop using cheap plastic water pumps that will split open like an over ripe melon when the o-ring does swell.
- Joel M.,
Leland, NC, US