No car should use coolant and it can destroy your liver if it does leak. But perhaps now its cold weather its just contracted slightly. Just like my tires all need 2psi adding.
The reason i was asking is that
I was getting massive headaches in the car but my aircon just packed up so guess ive been breathing refrigerant that damages your heart and brain. I had a suspected mini stroke in my car recently and lost feeling in half my face. Im going back to my electric bike. Cars suck.