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Just thinking that the thermal switch an probably be checked for resistance at different temperatures
If it just goes open or closed it could be jumped or disconnected to test that and see if fan runs.
The contacts in the relay might be blackened in a pinch you can usually carefully open them and clean the contacts up, or just replace. Sure clean up all the related connections grounds fuses etc just disconnect the battery and clean them, then put a bit if dielectric grease on them.
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