Hello,
Honda Accord euro, 2006. CL9, K24A3 engine, there is a some kind of grinding noise that appears from time to time only on hot engine, maybe someone has a clue? My suspects are on faulty water pump.
Thanks

 

Noises are tough to diagnose even with the video. You may want to remove the serpentine belt and spin each pulley by hand to feel for any strange resistance/vibration/wobble. Do this with the engine not running. The noise will be faint when doing this test and be much louder when the engine is running.