I have had the exact problem. Fan stayed on constantly, changed relay behind headlight fixed problem. Radiator blew, changed radiator and now it doesn't work. Will be working on it this week and following the above fix, will come back and post if it works.
Make sure all your ground connections are good and clean. That includes the main one from the battery to the block, fender and block to firewall and several other smaller ones on the block. Make sure the connectors are clean and have power where it should be. You have a fan relay behind and below the rt headlamp. that is the primary one for the fan. Don't forget that there are connectors under the power distribution center. A good fuse connected to a bad connector won't work.
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