I am starting this thread, because sometimes during research, I come across something that I have heard of, but don't know how it works or I am driving and thinking about car stuff, but don't know the answer. So when that comes up, I will have somewhere to go to get the answer (assuming I can't find it elsewhere).
I'll start with an easy one: Why don't we use a refrigerant like R134A to cool the engine (through the radiator) rather than a coolant like ethylene glycol? Is there a benefit that EG has over R134A?