The noise that can occur whether a Triscan- or OE pump (Triscan ref. 860029062) is used, is often heard at a certain rotation speed. If this is the case and the cooling of the engine is working properly - and the water pump does not show any visible signs of leakage or clearance - it is our experience that the noise is generated by the spring-loaded flange of the water pump.
The noise is caused by vibrations propagating in the water pump's outer pulley and causing the spring-loaded flange to vibrate at a certain rotation speed. The clearance between the two flanges is just a few tens of millimeters, and therefore the contact surface of the vibrating spring-loaded flanges can unintentionally hit the contact surface of the opposite flange, causing noise.
It is our experience that the vibrations often stem from the v-belt drive system, for example, a defective belt tensioner or a misalignment in the system. Instead of changing the water pump, the troubleshooting should focus on finding the true source of the vibrations.
The noise can occur on cars with the following engine type (11.2005 - 08.2015):
within the brands Audi, Seat, Skoda and VW. For more information about the car models and specific years: Enter 860029062 in Triscan's TriWeb (Ref. List).