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

 

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lwerbyj, Elkhart, IN, May 31, 2011, 08:23
 Rookie

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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  • Answer #1

    Superbob May 31, 2011, 08:34
     Master

    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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    lwerbyj, May 31, 2011, 08:38
     Rookie

    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.

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  • Answer #2

    mamamia803 May 17, 2014, 04:53
     Rookie

    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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