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Old 06-25-2004, 01:52 AM
bobterry99 bobterry99 is offline
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Join Date: May 2001
Location: Las Vegas, Atlanta
Posts: 670
If your car was manufactured in 1990, you ought to run diagnostics on the controller as explained here. The monovalve is shown below.
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1990  500sl NO HEAT-delete.jpg  
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