Water pump OEM Audi or GRAF

Graf with the metal impeller. No issues.

I've used Graf water pumps on two different E46s without any issues.

I ordered the kit from urotuning for my gfs 01 golf, been in for almost 2 years now no issues. They use a Graf water pump with a metal impeller.

I picked up a 3.6 brass impeller Graf waterpump for under $50 from www.autohausaz.com they also sell the oem thermostat.

As far as a water pump, the $24 Graf is your best choice. If you need the entire pump....that will cost more. I have also gotten very good water pumps from O'Reilley auto as well.....believe it or not. You probably should shy away from the plastic impellars.

I think I'll just grab a GRAF 30mm unit and compare unless someone has good info on brand quality/fitment.

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.

My '89 325iX doesn't put out much heat at idle, but as soon as I rev it to 2000 rpm, the heat starts coming out of the vents. At idle it is around 65°F air and at 2000 rpm it goes up to around 95°F (it is ~35°F outside today). I noticed a whistling noise that seems to come from the water pump at idle. Once the car got to normal operating temperature, I noticed that at idle coolant stopped coming out of the bleed hole. If I revved the engine a bit, coolant would flow. I replaced the water pump (Graf) 2900 miles and 3.5 months ago. My intuition is that the water pump isn't generating sufficient pressure at idle to move the coolant through the heater core.