Dave,
I have a 97 GLT 854. I have both "Moaning", as well as, air pump issues. The moan is, from what I have gathered, The belt drive in the "belt box". try pressing down on the top of the box after the car is warmed up to replicate the sound. I have not taken in the car to fix it.... My 850 still does well over 130 MPH as a low pressure turbo so I doubt it is such a major issue. The air pump is another problem. It has caused my O2 sensor to go off and sent the "check engine " light to come on for months now. I will wait to see what will happen when the summer months come about. As far as I can see, it is just an annoyance. If you have the $$ spend it to change serpentine belts... 99% sure that is the cause of the groan.. On my car it sounds liake a haunting moan in the morning.... Kind of creepy.. I dig it fully!!!!!! I would rather it not ve there but you know......................
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