There isn't one.
There is no such thing as a: temperature switch, on your Ford focus, the coolant temperature sensor is located on the front of the engine.
on the engine header
Relays are located in the engine compartment fuse panel
The 2000 Ford Windstar ABS relay switch is located on the firewall in the engine compartment. The relay switch will be on the passenger side of the engine compartment.
The engine: temperature sensor, on a Ford 5.4 liter engine, is located on the top of the engine. It is near the front of the engine.
The thermostat is located underneath the radiator hose where it connects to the engine. The thermostat regulates the engine's temperature.
The oil pressure switch is located by the oil filter on a 1979 Ford F-150. This will be by the lower drivers side of the engine.
The coolant temperature sensor on a 1989 Ford I6 4.9L engine is located on top of the engine, in the intake manifold. It notifies the engine when to turn on the cooling fan.
On the passenger side fire wall in engine compartment !
The temperature sensor on a Ford Focus is located on top of the engine, near the upper radiator hose. It sends a constant signal to the vehicle's computer about its temperature.
Where is it located? What does it cost? What's it's design purpose? you have to be more specific.The engine coolant temperature (ECT sensor) is covered in the "Related Question" below...
the oil pressure switch is located in the rear of the engine compartment on the drivers side under the valve cover