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Could it be your electric radiator fan, double check by turning your a/C the fan should turn on when you turn a c on see if that's were your vibration is coming from, change your heather/ac filter Not the engine filter hope this helps
Make sure it is not the heat shield attached to the converter that is rattling. If it is from inside the converter, it is breaking up and needs replaced. When they start coming apart is when they will block the exhaust and disable the vehicle.
I had a similar problem. The dealer change automatic transmission and differential, but the noise continu.
After research on internet i think the problem is the front galiper who create a vibration on the disc wheel and the vibration frequence follow
the front axle until interior car.
Just press slowly the brake pedal and if the noise stop , that's it the cause i think.
I dont change my galiper, but i have a new transmission . :)))
never worked on a hummer but rule of the day is that there always is a drain on the firewall on the engine side. usually a small rubber hose about two inches long direced downward. Usually you can stick your finger in there and clear it out. Don't shove anything hard into it or you can punch a hole in the evaporator core.