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Q:

Blower on 1997 Mercedes-Benz S420

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Does the A/C Blower have a fuse, relay or resistor that would keep it from blowing? Where is it located? How can it be accesed?
(1) Answer
It has all the above and a fan module to boot plus the switch.
here is a link to an online repair manual site:

http://bit.ly/mitchell_repair_manuals_online I would go the electrical section and start looking at the electrical diagrams for the Blower Motor and then do some tests.