What is causing my Vauxhall Zafira to overheat?

I've noticed that my Vauxhall Zafira is constantly overheating, even after I've had the cooling system checked and replaced the thermostat. What else could be causing this issue?

It could be a problem with the radiator. Check if it is clogged or if there are any leaks. Also, make sure the fan is functioning properly.

Have you checked the water pump? A malfunctioning water pump can also cause overheating.

Don't forget to check the head gasket as well. If it's damaged, it can cause overheating.