It took me waaaay too long to figure out the "clunking" noise as well but once I also replaced my waterpump its so obvious to me now that worn bearing was the culprit all along. Glad Toyota improved the waterpump with as new design from the original.

One thing I did was to simply set the new pump on top of the engine when removing the old one and placing the screws as i removed them into the new one, then swapped and installed one at a time. No mistakes and it went better than expected. I feel so much better this thing was replaced.

Just noticed the rattling on my 2011 rx, your video is quite good, thanks for sharing your knowledge
I’ll be using this to do mine 😊

Great Video. Thank you!

Please keep posting more Lexus RX maintenance and repair videos!

Especially any suspension replacement part or lubrication videos

Very informative video. I have a slight noise in my 2010 rx350 that might be water pump, so super helpful. Thank you.

Thanks for the video!  I like the process you used to pinpoint your issue.  We just purchased a 2007 RX 350 and I'm noticing this noise at idle too.  We had this happen before on my wife's 2015 Rav4 and it was the water pump too.  It started at 40k miles and I changed it at 80k miles once the noise was overbearing.  I also wondered how much longer it would have gone with the bad bearing.

Surprised the pump went out at 70k miles… my daughter’s RX350 went out at 160k miles….

Most of the time it is your belt tensioner not the water pump.

Hey. Great video. If you happen to see my comment this much later. I have a question for you.  I had my timing belt replaced with full kit.   Shortly after this noise started to develop.   To this day the noise is absent cold. It seems that as it warms up( maybe 3 minutes, or thermostat opens?) the noise begins.  Would you guess that would indicate water pump bearing or the pulley? Thanks

At 14:55 where the bolts of the water pump are shown, looks like the bolts' threads are coated with some material(s) to prevent leaking of coolant.  Anyone knows of the material(s) to use?  Thank you!

Was the rattle sound going away after warming up?