Allowing the temperature in your engine to bounce back and return to normal levels is the primary function of the thermostat assembly. Apart from that, it acts as a gatekeeper and blocks the flow of the coolant to the radiator during cold start-ups. Just think of it as the gates of the ancient mythical city Troy. Nothing can pass through it unless the fortress' entrance is opened. The thermostat is very crucial in maintaining the efficient performance of your engine because it serves a dual purpose-cooling the engine when heated, and heating up the engine when it is cold. Because it plays an important role in your vehicle, you should only trust reliable brands when it comes this part. The German company Gustav Wahler GmbH produces durable thermostat assemblies and other components that are necessary for your vehicle to gain optimum temperature and exhaust gas management.As a proof of its reliability when it comes to thermostat systems, Wahler was granted its first product patent in 1928, the "Thermostatic Regulation of the Coolant Circuit of Internal Combustion Engines". Wahler even upgraded the equipment of its Research and Development department after gaining the patent and put up an in-house bench dynamometer to better conduct research in the thermodynamics field. The Wahler thermostat assembly is fitted directly on your car's engine but it deflects the extreme temperature that is produced by the radiated engine heat because the brand only uses the most highly-resistant metal in crafting its products.Without an efficient thermostat assembly, the engine will suffer from idle starts and overheating. When the assembly fails, you can always seek the help of a Wahler auxiliary fan switch to help regulate the temperature, but it will never be enough to cool an entire machine down. Engine heat is good, but only if it's at the proper level. Too much heat can expand the metal parts drastically and this can lead to an engine breakdown, especially if the pistons become enlarged beyond necessary. But too little heat can also be detrimental to the engine parts. The pistons and rings in the combustion chamber will become loose and this could significantly reduce the performance of the vehicle.