Hello everyone,

I am new to the forum, as well as to Lexus, so please excuse me if I am asking about something that has already been discussed. I have a 2010 LS 460 Sport and recently noticed that there is a faint water sound coming from behind the glove box every time I accelerate from standstill and sometimes when the car is idle and the A/C is on. My initial thinking was that it is some sort of a clog in the A/C drain, and that's what I told my service supervisor at the most recent service at a Lexus dealership. They said that they could not find anything except for a bit of debris in the A/C drain, which they blew out, however the noise is still there. The best way that I can describe the noise is that its similar to a noise that a rainstick makes - Please let me know if any of you had something of the sort

 

air in the coolant system. A coolant pressure test can confirm it as it removes bubbles from the system.

 

Try opening the vent screw on top of the upper rad hose while the engine is running. When the bubbles stop, close the screw and top up the coolant reservoir.

 

Thank you very much hfahmy and roadfrog for your feedback. Took the car to dealer over the weekend to resolve the issue and they had to drain and replace the coolant. As they explained it, there was air in the coolant, probably from the factory because the system is sealed, that took a while to show up and make a noise. However, after the procedure the noise is gone. Thanks again.

 

Low coolant in my overflow, topped off, and back to silence while driving - thanks for the recs in here guys!