I installed an aux fan from a 1988 560SEL, and it worked fine when I tested it, but today it didn't turn on. I tried jumping the temp switch but nothing, I then tested my old fan which was working and it didn't work with the jumped wires either. Fuse #10 looks fine and my back up lights work which are on the same fuse as the fan. This leads me to think that it's the relay.

I found out while searching for the relay location that the older model W126s had two speed fans. Could that be the reason my relay went out? Thanks

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'81 300SD