I replaced all of the fuses in my 87 SDL today, even though they all looked fine.

When I turned the key to the 2nd position the aux fan came on high. This didn't happen with the old fuse, so I'm guessing that was bad, but I'm also thinking that the aux fan shouldn't run constantly with the key in 2nd position.

I juggled the icecube relays by the fuse box and the fan continued to run with each of the relays I plugged in.

After searching the forum for a bit, I came upon the possibility that the temp sensor might be causing the aux fan to run.

I found this:



and when I unplugged the wire with two plugs, the fan stopped.

Is the sensor my problem, or am I barking up the wrong tree/misunderstanding the issue?

Any insight is much appreciated.

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87 300SDL