Neither fans on the radiator work whether a/c unit is on or off. Both fans work okay when direct connection to battery is made. Dash light under petrol gauge comes on and stays on with key on and engine off or on, what should this tell me.
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Yes it COULD be a bad relay. But then again, it COULD be a malfunctioning A/C high pressure switch or a bad engine coolant temperature switch, or bad ground circuit, or any of the wiring in-between. If your Camry is equipped with the 2.5L engine, it could also be the radiator cooling fan control amplifier.The system must be properly diagnosed to locate the source of the fault.
the a/c when running creates a lot of extra heat and needs second fan, if second fan is not working right this will cause overheating, if fan is creating a load noise it is likely bearing is bad and will not spin as fast as it should not cooling. also check that fan it not hitting anything if you describe loud noise i can give better idea
check to make sure you have hooked up the fans properly. if you can ... test the fans by giving them 12 volts directly from the battery. also check that the fuse was not blown in the fan circuit. if it has and you replace it and it blows again ... you will need to track down the short circuit in order to fix the problem.
Look for: a bad relay " " fan " " " switch " " temp sensor a loose, corroded or broken wire at the temp sensor at the bottom of the radiator. Start with the relay. Buy or borrow a Haynes manual for this car, lotsa pics. You will need a continuity checker (cheap)