Radiator overflowing from overflow resevoir.

[fixkick]

the side tank way , of level checking works only on new cars
or cars with no bad hoses, and side tank
if the side tank (expansion Reservoir is bad, in any way, cracked, or dip tube in side missing or broken,) it fails.

this tank and 2 purposes
to catch expanded fluid as engine heats and water expands (physic's deal)
or to let the RAD suck said water back as the engine cools, keeping RAD full all the time. (if not , it drops level in RAD)
some side tanks have dip tube , integrated in the plastic tank, newer kicks.
both hoses must not be cracked, to and inside the tank or it fails to do 2nd job.