Get a new WP with metal impeller, Hepu, Graf.
Just to let everyone know, it did indeed turn out to be a defective O-Ring on the Graf water pump I installed a couple of months ago.
all graf water pumps with metal impellers are tested and balanced before packaged so why would there be any reason not to buy them ?
I wasnt planning on changing mine either when i bought my Audi TT and it had 61k miles on it and was just going to change belt and then at 100k the pump+belt.. when i took the pump off to see if it was plastic impeller style the impeller wasnt even attached to the pump.. it was just free spinning on the shaft.. i to this day have no clue how the car never overheated before that day.. cause i drove the car 2600 miles in 9 days prior to doing the timing belt. ill dig up the link but i posted a link on here of a movie how i could flick the impeller and it spun like 6 revolutions on the shaft without the actual shaft moving...
Just following up on this- I replaced the water pump and that appears to have resolved the issue. I have been monitoring it frequently and there has definitely been no sign of coolant leaking under the car in the area it was doing it from.
At 52k miles, it appears the water pump went out on our 2015 Audi A3 1.8 T FSI. It has been drinking coolant the last few months and leaving the garage smelling like anti-freeze... the coolant leak is visible beneath the airbox/battery area.
The stock pump failed back in Feb 2010, so i ordered a GRAF pump with metal impeller from ECS Tuning. Purchase was made on 1/27/10, parts got here on 2/03/10, and I installed pump late Feb 2010. Mileage was 127,257 when pump, timing belt, tensioner were done. In the middle of 2010, a loud grinding started at the front passenger side of the engine. I took everything apart and found the water pump with bearing grease or some waxy chunky crap all over the outside of it and on the inside of the timing belt cover like it splattered, and the pump leaking from the shaft. Car now has 135,362 miles on it, so thats complete pump failure within 8,069 miles.
I had a graff metal impeller waterpump start leaking from the weep hole about 2 months after replacement.
I had a problem with a metal impeller water pump: I did a tbelt change about 10K miles ago. Used a GRAF water pump with a metal impeller(I think it is most common with the aftermarket tbelt kits). The bearing seal started leaking coolant 8k miles later.
My local aftermarket dealer stopped selling Graf water pumps after two bearing failures in the last month (one failure destroyed the camshaft timing belt).
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