electrical cooling fan question ?

Hi , is there any realy for elecrical radiator colling fan ? where is it located ? i was told when a/c is turnedon the electrical
fan in front of the radiator should turn on, also when when the engine gets hot. right ? on my car it won't turn on , however when remove the plug to the radiator fan switch and jump the wires it will comes on , is there any way to test the senser(fan switch) ? any idia please let me know . thanks fred740il
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