Radiator fan
remove the relay and test it across the battery ,the two big connectoprs are the fan power supply and two smaller ones are the relay ,test the smaller one across the battery and see if it clicks ,if they click then test the big ones for continuety when the small ones are connected and gone click .Simple if all ok then test for power in the big connectors in the relay holder ,one of them should read a permanant 12v supply
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