Car temperature switches operate on the basis of turning on, based on a specific temperature. This is useful specifically in the air conditioning system, which can be made to keep the vehicle interior at a specific temperature. It is obviously not an essential function, and is considered a luxury, but a car temperature switch is a default fitted in many models of vehicle. Although not often needing attention, the device will need replacing if it becomes faulty, since repair is considered redundant due to the price.
A car temperature switch is designed to be easily replaced, needing only to be screwed out and a new device screwed in. This job is easily done by most DIY mechanics and even casual car owners. The trick is, however, locating the device in the vehicle, which can be a tricky task depending on the model of vehicle. It is often easiest to refer to the vehicle manual to see where the car temperature switch is located. You may also contact a professional mechanic with your car make and model for detailed information.
A car temperature switch is generally cheap and so not likely to break the bank upon purchase. It is important, though, to keep in mind that a specific type of car temperature switch may be required, so be sure to confirm the model required before making any purchases. It may also be difficult to find the right kind of car temperature switches for less common vehicle types, and these may require direct ordering from the manufacturer. In this case the cost may be slightly higher, or may even require searching for the part at a scrap yard if the vehicle model is no longer supported.