if you feel that your rad is plugged then just drain it (keep the fluid if it is good) (there is alittle stopper on the bottom of the rad) and then pour water through it, it your rad fills and none comes out then, yup its clogged. or if it trickles slowly out, then it also has an obstruction. you can also look at the individual pipes that run up and down to the car, if one is pinched then that could do you in also.
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.
Air flow restriction, Plugged radiator, Missing or broken radiator shroud,
Low on coolant, radiator fan inoperative, thermostat failed, water pump failed, radiator plugged