Hello,

Here is a guide that will give you an idea on how to change it.

https://www.2carpros.com/articles/replace-thermostat

Disconnect the neg battery terminal, drain the radiator, remove the thermostat housing. Pay attention as to how the thermostat is positioned so as to reinstall the new one the same way.

Please let me know if you need anything else to get the problem fixed.

Best, Ken