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onesmokindmax04 11-01-2004, 09:56 PM I was driving my truck today. I started hearing a humming noise & could not figure out where it was coming from. I found out where it is but dont no why or what it is. It is comin from the top head liner where the on-star speaker is. But i dont have on-star so what could it be? I had the truck re-flashed on Friday at the dealer. Could this had afftected anything? Thanks baimpala 11-01-2004, 10:32 PM That's not your On-Star speaker. That is a fan for measuring in cab temperatures. Don't worry I cussed that damn fan out many a time before I figured out it wasn't the On-Star microphone! Sounds to me like the fan is going south for the winter. . . . Dennis onesmokindmax04 11-01-2004, 10:39 PM so will it hurt to drive the truck in till i can get it in? Plan on a Long trip this weekin. socaldieseltech 11-02-2004, 01:09 AM Its called an aspirator. You wont hurt your truck driving it that way. | ||