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The reason the low [ a/c fan] was blown is b/c someone has switched relays or fuses..

The low fan is relay K10- and belongs in slot "B"... that is a 30A.,
not a 15 [ which will blow again]
The high fan relay K9 is in slot "C" and originally had a 15 , but
Benz has allowed a 25A replacement..

The dropping resistor for K10 is behind the left headlamp, but if you now have low a/c fan, the resistor is fine ...

Your problem for no fan was bad fuse..and under-rating was the possible cause of failure..
{ I am assuming chassis 124.131]