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Q: Engine makes loud whining noise when heater/AC is on on 2008 Lincoln MKZ

It happens only when heater/AC are on and only if I hit the gas and it hits 3500 RPM. Almost sounds like a street bike (crotch rocket) taking off from a start.
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I think maybe the drive belt is slipping on the A/C compressor making the noise. A defective compressor, a worn belt or a failing belt tensioner could be causing the noise. See if it makes the noise in PARK gear with the engine revved up and the A/C on.
FYI: the A/C compressor is engaged during DEFROST as well as during A/C use.
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Yes it does it in park as well. And it does it when either the heater OR the AC is on. Sorry, I don't think I was very clear when I wrote that the first time.
Was this issue ever resolved? My son's '08 MKZ has the same problem, and a Ford Fusion Club website cites a similar condition. The dealer replaced the serpentine belt tensioner.

http://www.fordfusionclub.com/showthread.php?t=384143
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