How to adjust Mercedes-Benz gl450 thermometer?

It doesn't have to be like this. Most thermostats are installed in the exhaust pipe of the cylinder head. This arrangement has the advantages of simple structure and easy elimination of bubbles in the water cooling system. Its disadvantage is that the thermostat will oscillate when it works. Some are still installed in the outlet pipe of the radiator. This arrangement can reduce or eliminate the oscillation phenomenon of thermostat and accurately control the temperature of coolant, but its structure is complex and its cost is high, so it is mostly used in high-performance cars and cars that often drive at high speed in winter.

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1. Thermostat is a valve that controls the flow path of coolant. It is an automatic temperature regulating device, usually including a temperature sensing element, which can open or close the flow of air, gas or liquid by expansion or contraction.

The thermostat automatically adjusts the amount of water entering the radiator according to the temperature of cooling water, changing the circulating range of water, thus adjusting the cooling capacity of the cooling system and ensuring the engine to work in a suitable temperature range. The thermostat must be kept in good technical condition, otherwise it will seriously affect the normal work of the engine. If the thermostat main valve is opened too late, it will cause the engine to overheat. If the main valve is opened too early, the engine warm-up time will be prolonged and the engine temperature will be too low. In a word, the function of thermostat is to prevent the engine from supercooling. For example, after the engine works normally, if there is no thermostat, the engine temperature may be too low in winter. At this point, the engine needs to temporarily stop the water circulation to ensure that the engine temperature is not too low.

2. Working principle

The main thermostat used is paraffin thermostat. When the cooling temperature is lower than the specified value, the fine paraffin in the incubator is solid. The thermostat valve closes the passage between the engine and the radiator under the action of the spring, and the coolant returns to the engine through the water pump and circulates in the engine. When the temperature of the coolant reaches the specified value, paraffin wax begins to melt, gradually becomes liquid, and the volume increases, pressing the rubber tube to shrink. When the rubber tube contracts, it acts on the push rod with upward thrust, and the push rod has downward reverse thrust on the valve, which makes the valve open. At this time, the coolant flows back to the engine through the radiator and thermostat valve and then circulates through the water pump. Thermostats are mostly arranged in the water outlet pipe of the cylinder head, which has the advantage of simple structure and easy removal of air bubbles in the cooling system. The disadvantage is that the thermostat is often switched on and off when it works, resulting in oscillation.