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Message: <blockquote data-quote="Vulxr" data-source="post: 22197" data-attributes="member: 8234">Hello all,I have a 2006 Equinox LT with 221000kms on it, and I was wondering if anyone had any ideas as to what this could be, some background info first, this vehicle has a bad supercharger like whine to it, and I looked into it and it is the A/C compressor or it’s clutch, but from what I know that is not causing a bad lack of power or it wasn’t before and it just got worse after replacing the heater core by coincidence. I’m making this for an issue that started after getting the heater core replaced, I noticed a flutter noise (it sounds like air pulsating/escaping or a bad pulley?) this only happens when I hit the throttle or the engine is under any type of load, this only happens in drive, for example it feels as if the brake pedal is being pressed but only when accelerating (no significant deceleration occurs when the car is coasting the brakes aren’t binding)  if that makes any sense it does not occur in neutral/park, it has had its water pump replaced, its transmission fluid changed, heater core replaced, as well its coolant changed.Edit: There are also no engine trouble codes, no pending codes, and no abs codes.Edit #2: The closest thing I could describe the noise to is a cicada flutter type of noise. Could be some sort of bearing Any suggestions as to what this could be/what to check would be appreciated!Thank you.</blockquote>