It could be the fuse, the relay or the fan motor. Start by checking the fuse and if it's good swap the relay with one with the same number if the fan doesn't run unplug it and use a test light to check for current if the test light lights the fan motor is bad. I hope this helps. Take care.
SOURCE: 2004 pontiac aztek cooling fans not working
relays control fans high and low. does fan come on with a/c on?hot wiring only will create more expensive problems in future!!!!! 2004 not 84
SOURCE: Cooling fan wont work
The water temp sensor is located near the thermostat housing. This sensor is what tells the ECM to turn the fan on/off. The water temp sending unit is located near the same area. You know you have the correct sensor is because the water temp sensor has a 2 prong plug. The water temp sending unit only has 1 prong.
SOURCE: 2000 cavalier 2.2L cooling fan will not come on
after you check the grond in the fan conector and all the fuses i can say its coolent temp sensor.
SOURCE: PO481 code Chevy IMPALA 2003
Looked it up in Chilton's, confirmed in http://www.obd-codes.com/trouble_codes/
P0481 Cooling Fan 2 Control Circuit Malfunction
Each fan will throw a different code. See 3 fans listed for your model. Here's a link for the wiring schematic: http://www.chiltonlibrary.com/content/images/WD/GM/014/WD_GM_014788.pdf
Best of luck.
Greg
Did you replace the sensor by the thermostat in the engine block or the one under the drivers headlight, There are two, the one next to the thermostat controls the temp gauge in the vehicle. the one under the headlight assembly controls the actual fans and is a electronic module. You have to remove the head light assembly to get to it.
Joe
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