2003 Lincoln Navigator Navi Knocking Sound Under Hood On Drivers Side Doesn T

2003 LINCOLN NAVIGATOR
140,000 MILES
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My navi has a knocking sound under the hood on, drivers side. Doesn't change with rpm. Just stays the same constant ticking. I've had oil checked and it's fine. Any idea of what this may be caused from?
Mar 13, 2013 at 3:07 PM
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