Lexus ES330 rattle noise from heater core and firewall when in drive and idling on Lexus ES330

Some Lexus ES330 owners report experiencing a rattling sound behind the dash around the heater core and firewall, particularly when the vehicle is in drive and idling. Common causes for this noise include issues with components such as ball joints, struts, and sway bar links, which may also produce a "clunk" or "knock" sensation when turning or going over bumps. Additionally, some owners note that heater core noises may arise from leaks or trapped air in the system, leading to hissing or gurgling sounds caused by corrosion, a cracked core, or loose hoses. Air pockets within the cooling system, potentially due to maintenance or leaks, can also contribute to gurgling noises. Furthermore, strange noises from the car heater may indicate a blocked fan, water leaking into the car, or a compromised heater core. It is crucial for owners experiencing these issues to diagnose and address them promptly to avoid further complications.