The car sewer pipe is not hot, the upper water pipe is hot! The water temperature is high, what s go

1. There are two possibilities: a. The thermostat is damaged and cannot be opened; b. There is air resistance in the cooling system, and the coolant circulation is not smooth.

2. Working principle:

How it works:The heat dissipation of the engine is to bring the heat of the engine to the radiator through the coolant, and the natural wind and the wind of the fan will take the heat of the radiator away. Two ways to cycle:

A small circulation, the coolant only circulates inside the engine, so that the heat dissipation effect is poor, but it can make the engine heat up as soon as possible to ensure the appropriate working temperature of the engine; In the second large circulation, the coolant will circulate through the water tank (radiator), and the heat can be dissipated through the natural wind and the air generated by the fan, so that the heat dissipation effect is fast.

3. A. The thermostat is damaged, which will cause the engine cooling system to not be able to circulate for a large time, so the temperature of the engine will be high. Solution: Replace the thermostat; b. Due to the air resistance of the cooling system, the engine coolant circulation is not smooth, resulting in an increase in engine temperature.

Solution: Remove air from the cooling system.

In this case, there are two possibilities:

1. Thermostat.

Damaged and cannot be opened.

2. The cooling system has air resistance and coolant.

Poor circulation. 3. There is air in the waterway.

How it works, as shown in the figure below:

Solution: 1. The thermostat is damaged, which will cause the engine cooling system to not circulate, so the temperature of the engine will be high.

b. The cooling system has air resistance.

Therefore, the engine coolant circulation is not smooth, so that the engine temperature rises, and the corresponding solution is to remove air from the cooling system.

The water temperature indicator is used to indicate the temperature of the coolant in the engine, and some will show different effects in color, blue means that the water temperature is too low, red means that the water temperature is too high, and if it is not bright, it means normal.

The water temperature light of the general instrument is always on, which means that the cooling system of the engine is faulty, and the common fault points are:

1.The lack of antifreeze in the engine cooling system may be due to a leak in the engine, such as a leaking water pump, broken pipes, broken water tank, etc.

2.A malfunction in the thermostat in the engine cooling system caused the water to be too hot. The temperature of the coolant was too high because the thermostat could not be turned on, which hindered the flow of coolant inside the engine.

3.The cooling fan in the engine cooling system is not working properly, resulting in poor heat dissipation of the coolant. So the water temperature light is on, causing the coolant temperature to be too high.

4.The water pump in the engine cooling system is faulty, and the water pump does not rotate smoothly, resulting in poor flow of coolant, so the water temperature light is on, and the coolant temperature is too high.

The above are common fault points, and the specific fault points need to be checked to determine the vehicle.

Hello, this is caused by the thermostat is broken, it can't be opened, you can disassemble it first and try the water temperature is high, okay, you can change the thermostat, I hope it can help you.

The thermostat is not open, or the thermostat is broken. The presence of air in the waterways can cause this condition.

Hello, the thermostat is broken, just change it.

It is possible that the pump is broken and does not circulate.

Hello, the thermostat is not turned on.

The engine is an important part of the car and is known as the heart of the car. The engine cooling system is the guarantee that controls the stable operation of the engine at the normal operating temperature. The cooling system consists of the following components:

Water pumps, thermostats, cylinder jackets, cooling fans, tank radiators, and antifreeze water pipes. When the engine's downpipe is not hot in the car, there are two possible scenarios.

The engine coolant temperature did not reach the normal temperature at which the thermostat was turned on, and the small circulation mode of the engine's internal cooling system with antifreeze was in progress. The thermostat is turned on, the engine enters the large cycle, and the heat of the upper and lower tubes will be basically the same. When there is a problem with the coolant circulation system, the engine drain pipe will not be hot.

This is mostly due to the fact that the thermostat is not turned on properly, the water pump is out of order, and the water tank and book cover block the air resistance, resulting in poor circulation channels. At this time, the water temperature may also be too high. In this case, the engine needs to be inspected and repaired in time to avoid abnormal damage to the engine caused by excessive temperature.

Thermostats are generally installed on the water supply pipe of the cooling system.

When the engine temperature is not enough, the thermostat is turned off. When the hot coolant inside the engine reaches the thermostat position, it stops flowing to the water tank, so the water supply pipe is hot. At this time, the low-temperature coolant pumped out of the water tank by the water pump flows in the sewer pipe, and does not participate in the heat dissipation cycle, and the sewer pipe is naturally cold.

It is normal for there to be a temperature difference between the upper and lower water pipes. The high-temperature coolant heated by the engine circulates in the upper tube, and the coolant cooled by the water tank circulates in the downtube, so it is normal for the two to have a temperature difference. The reason that may cause the upper water pipe to be hot and the lower water pipe to be cold may be the thermostat failureWhen the thermostat fails, when the thermostat fails, after the engine water temperature reaches the target temperature, the thermostat switch cannot be opened, and the thermostat is still closed, and the upper water pipe is hot and the lower water pipe is cold.

The high-temperature coolant of the faulty water pump engine enters the water tank from the thermostat, and after the water tank is cooled, it is pumped out by the water pump and sent back to the engine to participate in the circulation of heat dissipation. When the water pump fails, the pressure of the coolant in the water tank is not enough to enter the engine cylinder for cooling cycle, and the upper water pipe is hot and the lower water pipe is cool.

In this case, there is a high probability that the thermostat is damaged, and the water tank is not circulating at all, so the inlet pipe is hot and the outlet pipe is cold.

It is very likely that the car's thermostat is malfunctioning, or the temperature of the engine is too low, or there may be a problem with the water pump.

It is very likely that the water temperature of the engine is not enough, or it is also possible that the thermostat is not turned on.

The temperature inconsistency of the upper and lower water pipes is the reason why the thermostat is not open. The thermostat is not turned on, and the possible reasons are: the temperature does not reach the temperature at which the thermostat is turned on; Thermostat damage, etc.

Only when the thermostat is turned on, the temperature of the upper and lower water pipes is consistent, that is, the circulation system starts to circulate. When the temperature rises to a certain point, the fan will start running.

It's normal for the water to be a little cooler, because it's colder. But if it's hot, it's not right. This phenomenon should be normal for you, don't worry. Because: always a little lower than 90 degrees.

The car's water pipes, which have circulation and heat dissipation. The car generates a lot of heat when it runs, and if it is not timely, the body dissipates heat poorly, which will increase the wear and tear of the engine, and the life of your engine will become shorter.

landlord, if.

Upper water pipes and. The temperature of the tank is very high, even.

The water is boiling, and the sewer pipe is not hot at all. This illustrates.

The cooling water is not circulating anymore, that is.

If the pump is broken, why is the sewer pipe not hot, it is because the specific gravity of the hot water is small and floats on it, and the proportion of cold water sinks below and cannot be raised.

Convection. If the water pump is good, and the water tank is not well dissipated, then the upper and lower temperatures should be about the same.

If the temperature of the upper water pipe is high and the temperature of the lower pipe is not very high, it means that there is a problem with the thermostat.

It cannot be opened and closed normally.

size cycles, replace the thermostat.

Try to heat up the car first and then turn on the heater to heat it up, and the heater is not hot to prove that the water is not circulating. Then stop and idle to run, and then touch the temperature of the water pipe and the sewer pipe is consistent, and then see if the fan stops for a while and turns for a while, if it doesn't stop, it's not normal! Let's try it as I said and see what the results are, and we'll discuss it tomorrow!

Under normal circumstances, the water temperature of the water pipe on the car is generally within 95 degrees, so you first take the thermostat at the sewer pipe and then install it! Test drive, if the water temperature continues to exceed the standard, you will cool the car, and then open the lid of the water tank, the car is playing, fill the water tank first, and then bang the accelerator a few times to see if the water in the water tank is sprayed! If you don't spray, change the pump!

That is, the leaves are broken, and as for the water tank is blocked, this will have to wait until the problem is eliminated, and the possibility is very small.

It mainly depends on what the water temperature of your engine is, if the water temperature is 80 degrees, it is normal for the downpipe temperature to be low.

1. Thermostat failure.

When the thermostat fails, the thermostat switch with Qi Feng cannot be opened after the water temperature of the engine reaches the target temperature, and the thermostat is still closed, at this time, the water supply pipe will heat up and the water pipe will become cold.

2. The water temperature in the engine is low.

The thermostat switch is activated, and the coolant participates in the large circulation cooling of the cooling system. When the engine temperature is lower than the target temperature, the cooling system is still in a small cycle. The hot water pipe will cool down on the water pipe.

3. Pump failure.

The engine's high-temperature coolant enters the tank from the thermostat. After the water tank is cooled, the water pump is pumped back to the engine to participate in the circulating cooling work. When the water pump fails, the coolant pressure in the water tank is insufficient, and it cannot enter the body for cooling cycle, and the phenomenon of cooling water pipes and hot water pipes will also occur.

Extended Information: Precautions for repairing car water pipes:

1. Open flames are strictly prohibited.

Car maintenance must be inseparable from gasoline, engine oil, and these are flammable. Therefore, the issue of safety in car repair must be raised. Flammable and corrosive materials should be stored reasonably according to regulations.

2. Keep it tidy.

Car maintenance is not a clean and tidy job, but even so, the staff should try to ensure that the ground in the maintenance area is clean and tidy, and clean up the gasoline and oil stains spilled on the ground in a timely manner, which is also for safety reasons. And the clean and tidy operating room is also convenient for maintenance personnel to carry out repairs.