Why won't radiator fan come on? car overheating

1998 MERCURY MARQUIS
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TRICEY16
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bought a 98 marquis drove it home next day started it up after about an hour car began to overheat popped the hood noticed the radiator wasn't coming on. changed sensor, thermostat & radiator and all fuses & relays still nothing.
Nov 25, 2011 at 10:57 PM
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RASMATAZ
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Power the fan motor direct from the battery and see if it turns on-if so -Could be the computer controlled circuit of the fan relay
Nov 25, 2011 at 11:15 PM
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TRICEY16
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did that and the fan works that way...so if it is the computer controlled circuit how would i fix that?
Nov 25, 2011 at 11:20 PM
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RASMATAZ
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Check the wires back to the computer for shorts/open circuit if okay-think! computer
Nov 25, 2011 at 11:27 PM
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TRICEY16
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ok thanks so much for your help!
Nov 25, 2011 at 11:42 PM