Quote:
Originally Posted by Arthur Dalton
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 now correct..
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 then assume the high fan must draw more current than the low, [ not true due to resistor high draw of low speed] and mistakenly switch the slots... resulting in repeat fuse failure of a/c
low fan circuit/fuse.....
Recomment 20/25 A for high fan [ Benz approved this change],
as the 15 was found to be borderline on high fan [ coolant temp] circuit..
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Recently my '95 E320 wagon was running warmer than usual and I finally realized my low speed fans were not coming on. Thanks to this thread, I found the problem.
I've owned this car since 2001 and as far as I know, no one has worked on the a/c system during this time. But sure enough, the relays were swapped and the 15A fuse was blown. Thanks for helping me fix it!