In the "B" slot there was a Blue relay, and calls for a 15 amp fuse, part # 0025420119. In the "C" slot there was a Green relay, and calls for a 30 amp fuse, part # 0015429619. The slots were marked with a white letter under the relays. They were switched and I have now put them back as you suggested. >>


They are inter-changeable, so I see this happen quite often..
Usually happens when someone is testing relays and changes them , then forgets what goes where...
They mistakenly switch the slots... resulting in repeat fuse failure of a/c
low fan circuit/fuse.....
Recommend 20/25 A for low fan [ Benz approved this change],
as the 15 was found to be borderline on low fan circuit..
30A on coolant temp high fan.