I was driving around in Georgia's little heat wave were having and after a while of driving the truck starts sounding strange, like a loud strange. it had me freaking out, so i parked in the parking lot and nothings leaking, the gauges looked normal, so i start walking into target and i hear another truck sounding all loud and it was another blazer. his windows were up so i couldn't flag him down. is the loud sound just the AC kicking up a level or something else? i noticed 2 other chevy SUVS sounding similar but i just want to know without a shadow of a doubt that im in the clear.

 

i know the engine fans on these things are really loud, maybe thats it

 

ya know that could be it actually. makes sense.

 

yeah, mine does that sometimes too...it sounds like your getting ready to launch into orbit.
shouldnt be to concerned about it.

 

If the noise is constant after it begins then the clutch on the fan is probably bad and needs replacing.

 

Or the A/C clutch heating up in the very hot climate. That could cause the belt & other bearings as well to act up.