Diablo Blonco

Same noise every time, an ever so light horn sound that comes and goes between 70 to 80 mph. Not sure if it's air coming into the cab or something internal. Quite a mystery to me. Thanks

We just purchased a used 05 lx470 and it runs perfect except for an odd noise. When you're driving on the freeway around 70mph we get a horn sound coming from the driver side area. The noise can not be pinned down due to the fact the noise comes and goes. The sound does not come on al the time either. It's the oddest thing and it's not coming from the roof or tires. The noise is either coming from the dash or drivers door. Any thoughts would be great. Thanks