Steve, what is the procedure to test voltage at the fan to make sure the problem is the regulator? What should the voltage be on high? 1995 S350 - 265,000 miles - fan or regulator never been touched.

Thanks!

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1995 S-350
370K + SOLD
1952 220B Cabriolet
39K kilometers + SOLD
1998 E300D
310K +
2012 E350 BlueTec
120K