The Jetta's thermostat is located in the joint between the water pipe and the engine under the generator. Unlike most models, the Jetta's thermostat is installed in the return pipe joint.
The thermostat can change the water circulation range to adjust the heat dissipation capacity of the cooling system and ensure that the engine operates within an appropriate temperature range. The thermostat must be maintained in good technical condition, otherwise it will seriously affect the normal operation of the engine.
Detailed information1. Thermostat failure phenomenon:
1. In the first case, the thermostat is always open, which will cause the engine coolant temperature to slowly increase and fuel consumption to decrease. relatively high, especially in winter, the warm air will not be hot, and it will take a long time for the warm air to return.
2. In the second case, the thermostat is in a normally closed state, which will make it constantly in a small cycle, and the engine temperature will rise quickly, resulting in high engine temperature. , suffocation of water pipes and serious engine damage.
2. The working principle of the thermostat:
The main thermostat used is a wax thermostat. When the cooling temperature is lower than the specified value, the thermostat detects the temperature. the delicate paraffin in the body is in a solid state, the thermostatic valve closes the channel between the engine and the radiator under the action of the spring, and the coolant returns to the engine through the water pump to carry out small circulation inside the engine. When the temperature of the coolant reaches the specified value, the paraffin begins to melt and gradually turns into liquid. The volume increases andPress the rubber tube to make it shrink. When the rubber tube shrinks, it exerts an upward push on the push rod, and the push rod exerts a reverse downward push on the valve to open the valve. At this point, the coolant passes through the radiator and thermostatic valve, then returns to the engine via the water pump for heavy circulation.
Baidu Encyclopedia - Thermostat
Baidu Encyclopedia - Jetta