Is it normal for the upper water pipe of the engine to be hot and the lower water pipe to be cool

1. Thermostat failure.

When the thermostat fails, the thermostat switch 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.

The temperature does not exceed the normal temperature (70 degrees). The reason is that the circulation is not good and the thermostat is not turned on. There is also a situation where the tank has impurities and blocks the waterway.

A thermostat is a valve that controls the flow path of the coolant. It is an automatic temperature control device, usually containing a temperature sensing component, which expands or contracts to turn on and off the flow of air, gas, or liquid.

When the cooling temperature is lower than the specified value, the fine paraffin in the thermostat thermostat body is solid, the thermostat 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 for small circulation in the engine. When the coolant temperature reaches the specified value, the paraffin wax begins to melt and gradually becomes a liquid, increasing in volume and compressing the rubber tube to shrink. While the rubber tube shrinks, it acts on the push rod with an upward thrust, and the push rod has a downward reverse thrust on the valve to open the valve.

At this time, the coolant flows back to the engine through the radiator and thermostat valves, and then through the water pump, where it is circulated. Most of the thermostats are arranged in the cylinder head outlet pipeline, which has the advantage of simple structure and easy to remove air bubbles in the cooling system; The disadvantage is that the thermostat often opens and closes when working, resulting in oscillation.

Hello! If the water temperature is high, it is not normal, it is that the thermostat is not turned on. I hope mine can help you and have a great day! [If you have a problem with the car, ask the car master.] 4S shop professional technician, 10 minutes to solve. 】

It's not normal, it's normal at least it's hot. Not hotter than the sewer pipe [If there is a problem with the car, ask the car master. 4S shop professional technician, 10 minutes to solve. 】

Hello, the warm-up process will be like this, the water is warm, the thermostat is open, and the top and bottom are hot, I hope to help you [If you have a problem with the car, ask the car master. 4S shop professional technician, 10 minutes to solve. 】

Hello, this has to wait for the fan to work and then check, the fan works or the upper and lower water pipes are inconsistent that the thermostat is not opened, if it is a cold car, it is normal, the cold car thermostat is not opened, the water is not circulated, I hope mine can help you, if you don't understand something, you can continue to ask me! Have a great day! [If you have a problem with the car, ask the car master.]

4S shop professional technician, 10 minutes to solve. 】

Hello! The situation you are talking about is not normal. Generally, this situation will occur when the thermostat is broken, I hope mine can help you. [If you have a problem with the car, ask the car master.] 4S shop professional technician, 10 minutes to solve. 】

It's normal just after a while, and it's not normal after half an hour, and I may have a broken thermostat [There is a problem with the car, ask the car master. 4S shop professional technician, 10 minutes to solve. 】

This is certainly not normal. The air inside the water pipes is not drained cleanly. [If you have a problem with the car, ask the car master.] 4S shop professional technician, 10 minutes to solve. 】

The water temperature reaches 90 degrees, and the temperature of the upper and lower water pipes is about the same, thank you [If you have a problem with the car, ask the car master. 4S shop professional technician, 10 minutes to solve. 】

It's not normal, either the water tank is blocked, or the thermostat is not turned on and the big cycle is not carried out [There is a problem with the car, ask the car master. 4S shop professional technician, 10 minutes to solve. 】

In this case, there are two possibilities:

1. Prepare a celery warmer.

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, which makes the engine key temperature increase, and the corresponding solution is to remove air from the cooling system.

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.

Normal.

1. It is normal for the upper water pipe of the automobile cooling system to be hot and the lower water pipe to be cool, it may be that the water temperature of the engine is not enough, the thermostat has not been opened, and the coolant in the engine cooling system is still in a state of small circulation, so there will be a situation where the upper water pipe is hot and the lower water pipe is cold.

2. China's latest national standard "Terms and Definitions of Automobile and Trailer Types" (GB T 3730 1-2001) has the following definition of a pure car: a vehicle driven by power and with 4 or more wheels for non-track bearing, mainly used for: carrying personnel and/or goods; towing vehicles carrying people and/or goods; Special Purpose.

The water temperature of the engine is normal, but the warm air and water pipes are hot and cold, and the blowing is very cool.

Hello dear! Thank you for waiting, if the engine water temperature is normal, but the heater water pipe is hot and cold, then there are two main reasons to consider. The first aspect to consider is that your heating system has a heating water valve, so you need to check whether the heating water valve is damaged or blocked, if it has a heating water valve, you can consider replacing a heating air water valve directly.

The second aspect to consider is that the inside of your warm air tank is clogged. If you do not replace the antifreeze for a long time, it will cause the inside of the warm air tank to be blocked, which will cause your heating system to not circulate, so that the heating water pipe is also hot and cold, and the heating water tank needs to be replaced. Kiss!

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Summary. The blockage of the warm air water tank has no effect on the engine, he just has no hot warm air, and it has nothing to do with the heat dissipation of the water tank.

Hello, I'm helping you sort out the answers to your questions, please wait a moment

Hello, the heat of the warm air is not enough, the upper water pipe is hot and the lower water pipe is cold, and the warm air water tank is blocked. 1. Increase the throttle for a few minutes, and then touch the two water pipes of the warm air, if the heat is the same, you need to clean the warm air water tank2, if the heat is still stupid, the root is hot, and the cool base touches first, check whether the thermostat is in the closed position, check that the antifreeze is too dirty, it will also cause.

It's not normal, it must be a blocked warm air tank.

The blockage of the warm air water tank has no effect on the engine, he just has no hot warm air, and it has nothing to do with the heat dissipation of the water tank.

What is your local temperature and the large tank sewer pipe is not hot? If it is below zero, it is normal, and the water pipe under the water tank is cooled due to the wind when running.

You can drive, as long as the water temperature is not high, there is no problem, check that there is no shortage of antifreeze and it will be fine.

Okay thank you. You're welcome, the thermostat should be stuck in the open position.

Do you want to change the temperature?

If it is suitable, you should first remove the thermostat and check it, and if the middle ring is in the open position, it needs to be replaced.

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