Why must I add coolant every few days to my 2014 Chevy Spark, It seems excessive, but I haven't noticed any fluid on the ground?(😟)
You are either leaking it or burning it.
Some leaks may occur at a hose, radiator, or the heater core. The heater core leaking may cause your carpet inside the car to be wet.
If your radiator cap has failed, it will cause the overflow bottle to overflow, loosing coolant.
If you have a blown head gasket, cracked head, or cracked block, coolant can leak into your combustion chamber or into your oil. Check your oil and under the oil cap. If it looks like a milkshake, coolant has leaked into your oil. Check your spark plugs. If one looks oddly clean, that cylinder is burning coolant.