Weird noise in engine bay? Does anyone know what could be?

[JavierHG]

Hi everyone

I've noticed a weird noise coming from the engine bay, the car is running perfectly fine without any warning light.

Does anyone know or have an idea or what could be the issue?

 

Thanks in advance.

[steve2006]

It sounds aux belt related, try removing the belt then start the engine and see if the noise has gone. If it has check all the components on the belt run (alternator pulley, idler pulley, tensioner etc).

[Texas]

Deffo sounds like a pulley (bearing) in the aux system, which one should be apparent after belt is removed, or ( at your own risk) you could improvise with a screwdriver stethoscope and check each driven unit, water pump, idler, AC etc.

So…..did you ever get to what was the source of your rattling noise you reported back in Dec 2021,

https://www.lexusownersclub.co.uk/forum/topic/131180-grinding-noise-under-the-car-please-help/#comment-1212692

or is this the same issue and this is how it sounds today as you never reported an outcome back then?

[JavierHG]

Just got it diagnosed by to different garages as a faulty water pump, they are asking between £300-£400 to replace it (London prices..)

This video also confirms it: 

 

@Texas yes, the noise under the car was resolved by replacing an exhaust shield clamp, apologies for not updating the post, will do that now

[Texas]

👍

water pump can be got for about £125 I reckon and here’s how to do it!!!!

will need new coolant ( probably) but you do not have to disturb AC system👍

 

[JavierHG]

Thanks for the video @Texas but i just had it done this morning and just picked up the car, noise is now gone £300 after

[Texas]

Happy days….good for another 80-120,000 miles then ( Water pump at least😂)

[JavierHG]

I hope so