Message: I have 2002 dak QC with the 4.7 and I just noticed that at idle every 4 or 5 seconds I hear a noise that sounds like a hiss kinda. It lasts for 4 or 5 seconds then repeats you really need to have the hood open to hear it but it is very noticeable. Does anybody have any idea what this may be?
It isn't the A/C compressor cycling as the A/C isn't running when I hear this noise.
Thanks Mig
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Subject: 4.7 noise at idle