The wax thermostatic element was invented in 1934 by Sergius Vernet (1899–1968). [1] Its principal application is in automotive thermostats used in the engine cooling system. The first applications in the plumbing and heating industries were in Sweden (1970) and in Switzerland (1971). Wax thermostatic elements transform heat energy into Thursday 9th January 2014. The 2nd (or 1st) part of the dual valve stat opens to allow hot water to the heater before it opens it to the rad so you get a hot engine, then hot heater and hot rad Coolant Temperature Sensor Replacement Cost. The average coolant temperature sensor replacement cost is between $50 and $250, depending on the car model and labor costs. A coolant temperature sensor costs $30 to $100, and the labor costs $20 to $150. The coolant temperature sensor itself is often quite cheap, and you can often find them for The primary job of the cooling system is to keep the engine from overheating by transferring this heat to the air, but the cooling system also has several other important jobs. The engine in your car runs best at a fairly high temperature. When the engine is cold, components wear out faster, and the engine is less efficient and emits more a thermostat is used in a control system to open the load from the system or to connect the load to the system based on the temperature levels in the system. Which of the following are the two main types of thermostats? a. low-voltage and pilot duty. b. line-voltage and high-voltage. c. low-voltage and line-voltage. This is because the system stops blowing hot air or cooling air throughout the house based on the temperature of the air closest to your thermostat rather than running continuously. 2. The frequent stops and starts associated with the AUTO setting may mean costly blower repairs since the fan wears out faster than when using the ON setting. When a thermostat is installed wrongly, it can quickly go bad—for example, installing a jiggle valve upside down. When this happens, no air will enter the cooling system. Another case is the thermostat being installed backward. In this case, the part that is supposed to face the engine will face the radiator. Below are the functions of the hose in automobile cooling system: The primary purpose of a hose is to carry the coolant through the engine at an optimal temperature. Its design withstands the vibration produced by the engine. With the hose, coolant bypasses the radiator back to the engine. The pressure cap bled off hot coolant to the overflow tank. gK5sFX.