A hot radiator releases excess coolant through the spring-loaded cap in to the reservoir, and when cooled the partial vacuum created by cooled radiator pulls it back in. A reservoir should be only about 1/4 full cold on a system that uses a radiator cap, some cars have a pressurized cap on reservoir and no cap on radiator
As long as your reservoir has an overfill or overflow tube attached to it you can fill the radiator and the block itself with coolant and it will not hurt a thing.
Both. The reservoir is the overflow. But in the event your radiator is low, your reservoir will back it up.
Why does the radiator fill up the reservoir
Yes
The radiator does not have a cap, instead, the coolant system reservoir is also pressurized and the pressure cap is on the reservoir.
If the reservoir has a hose that travels to the top of the radiator, then it is filled with engine coolant. If the hose is not connected to the radiator, then it is most likely a windshield washer bottle.
The raiator is a type of system where all fluid is added to the reservoir instead of the radiator directly, look for the reservoir and you will have found your radiator cap.
My guess is that it should pur itself but double check with a parts store.
A household radiator is cast iron. An automotive radiator would be aluminum or copper.
It's only radiator cap is on the coolant reservoir.
There isn't one. Access to the radiator is via the reservoir.
The "radiator" cap is located on the coolant reservoir.