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its simply an air pocket in the cooling system, and youre hearing the air pocket rushing through the heater core
when you had the fluid drained/filled or flushed, the system was not properly bled. This is an issue on the gen 5's (assuming you have a gen 5, but it can happen on a gen 6 too) due to the fact the radiator sits lower than the engine block itself, so air gets trapped in the system easily. Most techs that do the coolant changes don't properly evacuate the system, so people hear that noise you are reffering to. I'd go ahead and take it to a shop or dealership and get them to look at it, as they could bleed the system properly.
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2003 CWP Lexus ES300 - MCV30 - 1MZ-FE
The "Executive Sedan"
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