Hey guys I hope you can help me out here. I have a 2007 tl auto with navigation and I am hearing a rattling sound when the car starts up it only happens when it's a cold start. It sounds like something is hitting something and going back and forth making a rattle sound. It will last about five minutes or so and when I drive in that time frame it still makes that sound when the car is running. With the rattling sound every time I turn the steering wheel it makes a humming sound also. Both sounds happen at the same time. The ratting is coming from the engine for sure. The car also makes a light humming sound when it's started and running not sure if that has to do with that. Took it to the dealer and they could not hear anything well the humming sound. I have recently got my serpentine belt changed and tensioner auxiliary belt. Part Number 31170RCAA04. Can someone please help me here I know most of you guys are experts!

Thanks.

 

Probably the power steering O ring. IRC that's commonly what the issue is.

 

Sound like this?

 

That's the sound! Bang on...what the hell is going on here! Thanks for the find

 

https://acurazine.com/forums/problems-fixes-114/diy-105-power-steering-whine-fix-754586/

There is also a second o-ring (in picture 2, just below those two 10mm bolts) that I replaced as well when I did my fix not too long ago. I also flushed the whole system put new fluid in, no whine since.