first check to see if your car is over heating at all, this would show that coolant is not being transfered though out your cooling system, second when the car is running feel your rad house going from the rad to the thermostat (big black house coming out of your rad) feel the ends of it if they aren't warm and not soft chances are coolant is not going though them. you could also bring your car in too have a coolant flush that would determine what is going on. i have not heard of a rad being plugged, usually they are just cracked and leek
radiator plugged up
Low on coolant, stuck thermostat, faulty fan clutch, plugged radiator inside, plugged radiator outside,
you could be low on antifreeze, could be a plugged radiator, or the radiator could be dirty. I had the same problem with my Dodge Ram and it was a plugged radiator
When the current one is leaking or plugged.
either radiator plugged or blown head gasket
depends on how much air you have
Low coolant, inoperative radiator fan, plugged radiator, failed water pump, etc.
Weak solder joint when mfg.? Excessive water pressure due to: 1) Bad radiator cap 2) Plugged radiator 3) Thermostat not opening 4) By-pass hose crimped or plugged 5) Leaking head gasket(s) Possibly the radiator hose was weak. So in other words, a bad radiator hose.
A stuck closed thermostat, a fan clutch failure, a missing radiator shroud, radiator plugged internally, radiator plugged externally with leaves, low on coolant because of leaks in the system and worst case a bad head gasket or cracked head.
I have found the common causes for this are, a plugged heater core, and a poorly working water pump. The radiator could also be plugged.
Check the thermostat or the radiator. The thermostat could be sticking or the radiator could be plugged.
Low on coolant, radiator fan inoperative, thermostat failed, water pump failed, radiator plugged