Replace it with a new or good used one.
Best bet is to replace the radiator.
blown head gasket or cracked head.
if its in the reservoir it should be in the radiator of it is then it has a blow head gasket or a crack head
A cracked radiator can not be fixed. A cracked radiator needs to be replaced . A mechanic can replace one in a few hours.
Is it leaking from the side by the coolant reservoir?
No, this could mean you have a cracked head gasket and engine pressure has entered the coolant.
Both. The reservoir is the overflow. But in the event your radiator is low, your reservoir will back it up.
The only way to fix that problem is to buy a new radiator. Your old one has cracked around the fitting.
You can replace pipes and hoses relatively easily, but if the radiator itself is damaged, you can't fix it. You will need a machine shop that can actually repair the cracked metal.
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
There are various things which could cause a cracked radiator. You should try to consult a professional on the matter.
If it's repairable, a reputable radiator shop will be a good resource. They can tell you if the radiator can be repaired or if it must be replaced.
You need to but a new one soon or your car will overheat from lack of pressure to keep the water cooled. Compared to most car parts they are inexpensive.
Why does the radiator fill up the reservoir
The radiator does not have a cap, instead, the coolant system reservoir is also pressurized and the pressure cap is on the reservoir.
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.
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.
If the radiator is cracked then the vehicle has ran dry on coolant. This would cause the radiator to crack if there wasn't any coolant.
the car over heats which can cause the heads to become warped or even cracked fix it asap that's something that you cant hold out on it will cost alot to fix it if you do ....
either a cracked head or a blown head gasket.
It would depend on where and why it cracked.
The radiator hoses could be cracked, look where they are clamped to the rad. and engine. The radiator itself could be rusted or cracked somewhere.
My guess is that it should pur itself but double check with a parts store.