I would doubt it. It's brand new, let your dealer know.

 

I have the same problem with my 2017 RX350, occasionally on passenger side too. The dealer tried to fix it. It is better but not 100% fixed.

 

 

I did brought to the dealer and they said they cant hear it. Just to fix the handlebar i had to come back to the shop like 5 times. they fixed one thing broke another thing. Looking to change dealership service.

 

That's why in a case like yours, you need to be in the car while they're test driving it and when you notice whatever it is you're looking for, immediately point it out to them. That way, they can't say they didn't hear it.

 

I thought I had a rattle problem on the passenger side, but it turned out to be from the passenger seat belt.
If the belt has been rotated 180 degrees, the metal tab can hit the door frame.
Solution, reach across and flip it, or threaten any passenger who does that

 

Hello everyone,

Brought a month old 2019 RX 350 to dealer with both rear windows rattle while driving with windows opened about two inches.
Was told window runs have to be replaced.
Multiple days later received a call from service adviser, saying suspected parts were replaced but it didn't fix the problem.
Adviser also claims, the dealership contacted Lexus Corporate and was told the rattle noise is normal.
Which was supposedly confirmed by inspecting several vehicles on dealer lot.
I m being told, there is nothing else the dealer can do for me at this point until Corporate issues a fix.
Does anyone else experience similar issues? Any suggestions on how to proceed further?
Any help is appreciated.
Thank you

 

Go to your dealer and ask to drive another car like yours and see what that one does. Just be advised that with some cars, driving with only the rears open may cause some buffeting. If that's the case with yours, just open one or both of the fronts a little.

 

Like ravenuer said having windows partially open at the rear will cause buffeting, that's always the case on cars from my experience. Why do you want to drive around with them open anyway, I like the serene atmosphere of the vehicle without dirt, heat/cold getting in.

 

Thank you for replying.

None of my other RX vehicles had this rattle-"buffeting" issue when driving with windows propped open. Actually, rattle occurs with front windows open as well.
Recently both front windows have developed a thud sound right before closing completely. Dealer of course couldn't verify my complaint, no surprises there.
Paperwork from service department says exactly what adviser claimed on the phone. So at least it's in writing.
Will try and contact Corporate directly and stop by dealer to test drive other vehicles.

 

In addition to rear windows rattle when opened, now driver side window rattles when closed.
Combined number of issues on this brand new vehicle is just mind bugging.