the easiest 1st step in fan diagnosis is to just bridge the two wires at the temp sensor in the radiator. The fan should run. If not, you'll have to check for power and ground. It varies abit on different year cars, but corroded fuse connections are common. The fuse may not be blown, but it may be loose and/or corroded on the ends.
A good fix is to remove each fuse, and clean the terminals with a small wire brush. Coat the terminals with dielectric grease and squeaze the terminals so that the fuse fits tightly.
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