Finally gave up on this and took it in to Hatch & Sons (Now called Heritage Motorwerks; they have been acquired by another company...that owns one of the big MB dealerships)....

My second experience with Hatch & Sons was good as the first one...root caused precisely to a bad CTS...the new one I installed was an aftermarket (Hamberg Tech) and it had not been turning the fans on at the trigger temp.)

Lesson learned...stick with MB parts for electrical stuff...

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Matt
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92 400E 128K
99 GMC YUKON 88K