97 Sunfire GT rad fan won't turn on

locnar, it's not clear why you think you have a problem. You don't actually say that the engine is overheating. The fan is designed to come on only when needed, so if the engine isn't overheating when the a/c isn't on, the fan shouldn't come on. Typically, engines run hotter when the a/c is on, hence the reason the fan kicks in. If the engine isn't overheating when the a/c is off, you don't have a problem at all.

Just a slight correction. The cooling fans come on when the A/C is on, not because the engine runs hotter, but because the A/C system has to have airflow through the condensor in order for the A/C to work properly. So if you are sitting in traffic with the A/C on, the fans must be on. Which is why it's often better in stop and go traffic to have the A/C on....you end up regulating the engine temperature at the thermostat temp. If you leave the A/C off (in the mistaken belief that the engine will run cooler) the engine will cycle between the t/stat temp and the fan on temp which is quite a bit higher.

Ian

Thanks for the correction Ian. You keep teaching - I'll keep learning! ;-)