Most likely you have a damaged - locking a/c compressor internally.............
Remove the compressor and pour it in. If its making noise its probably to late and you will need to replace it.
Its usually its pretty heavy and lightning making thunder because?
theres is to many things that could becausing it, so its hard to tell. the best thing to do is jack both front teires off the ground and try to wiggle the tires back and forth, there should be no play (or movement).
Check you E-Stop Brake on the rear.
god Zeus is in charge of making thunder
Chain alignment is off between the freewheel and front chainring. Also check chain tension when installing the back wheel.
bcuz the sky vibrates making a loud noise
You could have a starved CV joint. Take your blazer to a wide-open space (i.e., vacant parking lot) roll your windows down and turn the vehicle in tight circles in both directions. If the noise is present have a mechanic check your CV boots/joints.
It means that the compressor is broken inside, and it is time to replace it.
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Probably something is loose or worn... sorry to not be more specific, but you'll need to track it down to see WHAT is making that noise.
It sounds like you have a very tight running or bad a/c compressor since most all systems will engage the compressor when the defroster is on...............