I drive a 2009 Honda Accord Sedan 2.0 EL (thailand )?

A noise comes on from the left air vents when driving on the highway at high speeds 70-80 MPH with AC on/off

The noise comes on for about 5 sec when I change the lane from left to right or driving over 70 mph, it sound sort of "hollow " like something flapping on a plastic bowl?

Went to dealer and, as usual, could not find anything

The description is not clear but the most common cause for 'Hollow' sound like is a sticking expansion valve.It's a big job so you'll need some professional help.

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