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As I understand it, between autocross runs there really isn't a problem w/ the coolant getting to just below the 220 mark on the gauge. But I just don't like it. In previous cars I have found that if I have a manual switch for the rad fan, I can turn it on myself and, rather than the temp cycling up to fan on and then down to fan off (which never happens) I can keep the temp much closer to normal. I have not been able to find a wiring diagram that I am positive is correct for my 19 Stingray. The one I found shows two relays, one for each fan, as well as an ecu. Is there a way to add a switch to the circuit or a temp sender that would bring the fan(s) on at a lower temp.
There's no 'on/off' signal for the fan. There's also only one fan. The PCM sends a variable pulse width modulated signal to the fan control module, which tells the fan controller what speed to run the fan motor at. The only way to add a switch would be to bypass the fan control module entirely and basically hotwire the motor. It may also be possible someone makes an add-on module that goes in between the PCM and the fan controller.
Alternatively, you could look into a custom tune that changes the fan activation thresholds. But there could be warranty implications since your car is relatively new.
When I saw there was a module involved I was afraid this might be the answer. Although I am quite comfortable w/ changing relay wiring, I don't want to mess w/ a module.
Sounds like the operating principles are the same. The connectors are totally wrong though. I wonder if the signal is similar enough and you could just retrofit the correct connectors?
The people that hard wired in their C6 fan to keep the temps down tended to melt/burn the wiring connection to the fan. I wouldn't be tempted to hard wire in a switch since there could be a downside to the project that costs you a lot more money.
Have you tried turning on the AC while waiting between runs. The fan runs most of the time when the AC is turned on.
Radiator fan control
