I have a 2004 TL that started having an unusual problem (I'm assuming with the air conditioning) last fall and it started again this spring. After running the AC for an hour+ when making a left turn you can hear a sound from the vent/dash similar to "slush" sliding from side to side. Every time this occurs, the next morning there is a puddle of liquid on the passenger floor (assuming water, it has not stained the carpet). Has anyone experienced this???

 

Bet your drain line is clogged.

 

^^^ +1. Don't want to scare you, but a few folks have had their ECU/PCU fried by a clogged drain tube.

Some guys have had the tube intentionally plugged by the tech during an oil change because apparently the tube drips right on the techs during the change. The techs forgot to remove the screw when done and days later: fried ECU/PCU.

 

^^^ PCM I guess, not ECU/PCU

 

Welcome to AZ Maybe this thread will help:

https://acurazine.com/forums/3g-tl-2004-2008-93/might-new-one-3g-tl-garage-f-127-a-566392/