The Ford Fiesta Zetec (depending on the year) doesn't have a thermostat in the traditional sense of a readily accessible unit you can easily see and replace yourself. The thermostat is
integrated into the engine block or
housing itself. This means it's not a separate component you can simply locate and swap out.
To access it, you'll likely need to drain coolant, partially disassemble parts of the engine's cooling system (potentially including the water pump), and often requires specialized tools. It's a job best left to a mechanic unless you have significant experience working on car engines.
