Why does the engine temperature of my Vauxhall Vivaro keep fluctuating?

I have noticed that the engine temperature of my Vauxhall Vivaro keeps fluctuating, sometimes it is in the normal range and other times it goes too high. What could be causing this issue and how can I fix it?

This could be due to a faulty thermostat. It is responsible for regulating the engine temperature and if it is not working properly, it can cause fluctuations. You should get it checked and replaced if necessary.

It could also be a problem with the cooling system. Make sure there is enough coolant and check for any leaks or clogs in the system. If needed, take it to a mechanic for further inspection.

In some cases, a dirty or clogged air filter can also cause engine temperature fluctuations. Check the air filter and clean or replace it if needed.

It is important to address this issue as soon as possible as fluctuating engine temperature can lead to serious engine damage if left unchecked.