From easiest to hardest: Does radiator have enough coolant? Is the fan working? Could be a bad thermostat. Water pump (there is a small hole in the bottom of the water pump. If there is water dripping out of the "weep" hole, then the water pump is bad). Could be a blown head gasket. (Is there any water in the oil or does the coolant in the radiator have a fuel smell?
If it is leaking trans fluid into the coolant it can cause overheating.
Thermostat, blocked radiator, leaking hoses, rusted impellers on the water pump and the worst possibility, a leaking head gasket/cracked head.
Thermostat, blocked radiator, leaking hoses, rusted impellers on the water pump and the worst possibility, a leaking head gasket/cracked head.
try taking out the thermostat and have you put to much oil and coolant in the radiator
The radiator will need to be replaced. Sometimes, it may seem that the radiator itself is leaking but it could be the radiator "hose" that is leaking. In this case, the radiator hose needs to be replaced and clamped tightly.
Could be many things. Failed/failing waterpump. Thermostat jammed open/closed. Radiator leaking.
Check radiator hose, leaking water pump, look for hole in radiator, leaking coolant bottle or leaking seals.
your piping for the coolant system or radiator could be leaking and causing a loss of coolant making the temperature rise. Have you had it pressure tested?
Maybe it's not the radiator. Maybe it is one of the radiator hoses that is leaking. Or possibly the radiator cap or a level sensor.
The heater core is leaking. GEt a manual from DISCOUNTAUTOREPAIRMANUALS.COM and replace it.
If your radiator isnt leaking and car is having a over heating problem and coolant spewing out. Chances are your thermostat needs replaced. possible the radiator needs to be flushed. But more likley its thermostat
"transmission fluid leaking from fitting below radiator cap after replacing radiator on 99 surburban