Jeep antifreeze reservoir
Fill it to the cold line if the engine is cool. To the hot line if you have been driving it.
Will it hurt anything being empty
If you let your cooling system get low on coolant your engine will eventually overheat. Buy some pre-mixed 50/50 coolant and add a little to the tank.
The radiator tank is full, but antfreeze tank is empty.
I'm sorry, I have to respond to this. YES you have to fill the reservoir! If not, Bye Bye Motor!
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