the fan can be installed backwards and moving the air through the radiator in the wrong direction.The radiator or cooling ports can be plugged if a stop leak has been used on the engine.the water pump might not be working.
are the cooling fans coming on
A 2001 Mitsubishi Spyder will experience overheating even though the fluid is good and the fans are working if the thermostat is stuck. A stuck thermostat will prevent coolant from circulating and will quickly overheat the engine.
head gasket, low oil or antifreeze, malfunctioning fans.
If it has the 3.5 motor, it may be a matter of bleeding the air out properly. There are several more common causes of overheating.
Check thermostat make sure fans work replace coolant easily done check manual
If it has electric fans, make sure they are coming on when it get's hot. If not, then check the fuses and relays for them and power to the fans. Might just be a relay for the fans.
Inoperative radiator fans, bad water pump, failed headgasket?
Maybe check both electical fans between radiator and engine.
The thermostat determines when the engine is hot and switches the fans on and off. You know it is working because the fans run. You need to get the water pump replaced, because the coolant is not circulating (that is why the radiator stays cold even though the engine is overheating). Because this requires the cambelt ("timing belt") to be removed and then put back in the correct position afterwards, this is not a simple job and is likely to cost you a couple hundred quid. Take the opportunity to check your service history for if the cambelt is due to be changed in the next 10,000 miles - if it is, you can save money in the next couple of years by getting it changed at the same time.
If the vehicle has electric cooling fans, do they turn on? Could use more info like year, make and model.
My first thought is have you checked your fan? Some fans spin but not fast enough. Electric fans get weak and direct drive fans have a clutch that gets weak. Another issue is the air dam ( the piece of plastic under you car). Most cars are designed to push air through the radiator if the air dam is missing it might be a problem.
Most likely you have overheating, that's why the keeps running. You need to check the temperature control sensor and the thermostat.