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A few. weeks ago my indy 2004 had the code po 0481 and this mean fan relay 2 are bad. I buy the relay and change. the termostat, water pump ,change the coolant but i have the code po o481. My indy temp are to 195 to 225 but i used power go to 245 near to red zone . my english is poor but i hope someone can help me.
 

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I had/have the same problem in my 2000 3400 Impala. Check to make sure the high speed cooling fan powers on. I threw that same code but it wasnt the relay, it was the fan motor. Check that. However, I checked my fan and cleared the codes. But the codes came back on. It wont stay off. However I dont run hot anymore. I only get to around 210-220 max and I live in south Florida(so its really hot down here) So basically check the fan. Also you can swap the wiring harness around with the 2 fans to see if they both kick on. But odds are its your high speed fan.
 
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