The automotive industry specialists are well known that today, almost every technical solution of the automaker in the design of cars is aimed at reducing engine emissions and reduce fuel consumption. As a result, the mutual integration of various aggregates and car devices is enhanced, which leads to the complication of its design.

Cooling systems are also susceptible to this trend, often playing a decisive role in this process. The growing requirements for the efficiency of motors in the complex with such factors as an increase in the coolant flow rate, the wide use of turbocharging, autonomous heating and air conditioning led to the transformation of traditional cooling processes and the appearance of more complex integrated systems.

Effective thermal regulation in all parts of the engine — from the hot cylinder head to cooler areas, from the very moment of launching and until operating temperatures, is vital to ensure the parameters of harmful motor emissions declared by the automaker. This is critical for compliance with the legislative environmental requirements of a number of countries where new restrictive measures can be introduced in the near future. In the future, increasingly tightened environmental norms will require an increase in the degree of compression and operating temperature of the engines by 10% to ensure optimal fuel combustion. This trend will entail the creation of more powerful cooling systems with which the car will be able to work effectively throughout the life.

In addition, effective thermal regulation is one of the key factors in the control of engine wear. Without adequate control of the temperature of damage to the internal components will be inevitable even if there is high-quality oil in the motor.

It is the thermostat that provides control of the temperature of the engine, controlling the flow of coolant in the system. With it, the engine quickly reaches the optimal operating temperature and maintains the necessary thermal mode.

As the importance of controlling the temperature of the engine increases, the design of the thermostat is also improved. Its classical version was first developed in the 1920s and remained almost unchanged until the end of the last century. Modern thermostat — a device of a completely different technical level. It is enough to look at these varieties such as a thermostat built into the cylinder block, or a controlled thermostat, capable of dynamically changing the bandwidth on the motor control unit.

It should be borne in mind that if the thermostat is not able to accurately withstand the temperature required for this motor, the error even in 1-2 degrees will have a significant impact on the emission level indicators. For this reason, when replacing the thermostat, it is advisable to use the spare parts of the original quality.

Installation recommendations

Replacing a traditional type thermostat — the process is quite simple if its body and surface are carefully cleaned and a new gasket is used. Along the way, in the process of installing the thermostat, you can check all parts of the car cooling system for signs of wear.

Traditional thermostats have a safety (or swinging) valve, which is located on a special protrusion. It is designed to relieve overpressure in the cooling system and prevent air from entering it. When installing this valve, you need to trace it to be on the upper side of the thermostat case. Then the steam will be freely emerging outside, preventing the formation of air traffic jam in the cooling system.

Another common thermostat type is reverse (or bypass). Its designs have two valves that guide the coolant flow through the engine and the radiator. When the motor is not yet warm, the thermostat closes the path for the coolant through the radiator, directing it to a small circle of cooling — around the engine. When antifreeze heats up to operating temperature, the thermostat opens the channel going through the radiator, and closes the nozzle, returning the liquid back into the motor along the shortest path. In the radiator, the liquid is cooled, which makes it possible to accurately monitor the engine temperature.

You must make sure that the selected thermostat type is suitable for a particular motor. For example, the installation of an ordinary thermostat in the bypass system may result in the engine to function with an increased or reduced relative temperature for it, and this will reduce its operational efficiency.

In the case of thermostats built into the engine block (controlled thermostats), it is necessary to take into account the fact that their increased complexity affects the calculated service life and, importantly, at their cost. Therefore, it is not necessary to replace them on the principle «and so comes up.» From the quality of the manufacture of such a thermostat directly depends on whether it can work in the hard frame of the parameters prescribed by automaker, and how long it will last. OE-quality should be reference for this type of components.

Technological know-how, high-quality materials and precision assembly provide DAYCO products the highest level of performance. The company offers an exhaustive range of thermostats that comply with the standards of original components in quality, efficiency, safety and durability.

Additional information about the thermostats of OE-quality DayCo and other products for the auto parts market — on the site