Fan not working
Water pump not Working well enough
Stuck Thermostat.
Air Bubble in system
Head gasket failure
Radiator plugged or coated inside
Radiator dirty or plugged stopping airflow
There could be many reasons. Not enough coolant or bad flow, faulty thermostat, low oil. If the coolant freezes then it will overheat. If your car continues to overheat then you should have the coolant flushed and thermostat replaced.
Yes, it controls the coolant flow around the engine block, without coolant the engine would overheat.
drive it without coolant
YesYes
Yes
Yes you can. A cracked block does not necessarily mean the car will overheat. If a block is cracked at a coolant jacket then coolant will leak out and the car will overheat if the leak is bad enough. If the leak is not very major or if the crack is at a point that does not have a coolant jacket then it will not overheat. A cracked block could leak oil, compressed air/fuel, coolant, or nothing at all and still be cracked. -R. Mesyef
It willl overheat when it gets low on coolant.
Yes, low coolant will cause it to overheat without the AC; that is not the only reason that will cause overheating however.
A leaking heater core will cause the engine to overheat because the coolant is leaking out.
Yes, a car needs a radiator to run because it stores the coolant for the engine and dispenses it when needed. So, if it didn't have one the car would overheat and not be able to move :)
cools the engine. without a fan, the car will overheat and the coolant will boil. the fan controls this from happening by cooling the coolant as it passes through the radiator.
Yes! if you have a cracked head chances are your oil and coolant are mixing together and coolant and or oil is leaking out causing the vehicle to overheat... if you have a cracked head fix it! do not drive the vehicle