reley location for ax fan its on all the time 400 se 92

The aux fan relay is in the rear of the fuse box. There should be about 8-9 relays. UNDER each relay is a "letter" painted on the connection. Remove each relay & look for a B/C position! That is the aux fan relay.

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MERCEDES Benz Master Guild Technician (6 TIMES)
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See? I told you so

Sixto
95 S420
87 300SDL