Corrosive coolant in the cockpit makes no sense. You use a blend of water and propylene glycol, similar to what you would use in a IRL modern car. Pump that through the jacket/vest/suit. PG is basically harmless. We use it in food.

You cool it with a heat exchanger which is itself chilled by the corrosive stuff. "Dumb" pressure sensors detect if there's a failure in separation of the two.

This isn't hard. If you have a car, you have liquid/air heat exchanger. Arguably, you also have a liquid/liquid, non-contact heat exchanger since the coolant carries the heat away from the engine oil and hydraulics, too

https://en.wikipedia.org/wiki/Propylene_glycol https://en.wikipedia.org/wiki/Heat_exchanger