Sounds like your water pump is shot. The impeller is spinning on the shaft and not pushing the water. I just had a customer who had this problem. The crazy thing is, I just replaced the pump about 2 years/30K ago with a GMB pump. He had the exact same symptoms as you: car gets hot, but does not overheat, no water through the return line, and fan takes a long time before it turns on.
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...
the aux water pump is leaking you can do it without taking the intake manifold off thru the driver side rear if the engine shouldnt cost you more than 200 when your all done
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.
Had mine replaced last month before it broke again. The component that failed was the gasket for me then the pump failed and wanted money.
Had the dealer do the water pump on my 09 A6 3.0t and it was like $1800 for that alone.
I put in a GMB in my '02 two years ago, and it's leaking already.
Waterpump and thermostat are common issue with Audi. I had a 2017 S3 and had it replaced around 65K miles, and now my 2019 S5 was replaced under warranty at approx 38/39k miles. The mechanic mentioned something along the lines, its made out of plastic.
My water pump and thermostat just went out on my ‘18 Allroad and was pleasantly surprised to find out that they were both under an extended warranty even though my car’s general warranty had expired last year.
My waterpump developed a crack 3 weeks ago and I started to leak coolant. Car had 20,000km on it. Had it all replaced under warranty. Was open about the mods on the car as well and dealership didn't give me any issues.
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