Why is my Ford Mondeo overheating after changing the radiator?

I recently had to replace the radiator in my Ford Mondeo due to a leak. But now, the car is constantly overheating. I've checked for any leaks or damage to the new radiator, and everything seems to be fine. What could be causing this issue?

It's possible that there is an air pocket trapped in the cooling system. This can occur when replacing the radiator and can prevent proper circulation of coolant. Bleeding the cooling system should solve this problem.

Make sure the thermostat was also replaced when the radiator was changed. A faulty thermostat can cause the car to overheat.

Check the fan and fan relay to ensure they are functioning properly. If the fan is not turning on, it can cause the car to overheat.