Why does the water temperature rise slowly in the car?

Because next to the pump, there is also an important part of the cooling system - the thermostat.

When the car starts cold, the thermostat does not turn on, so that the coolant.

It does not go through the tank, only small circulation is carried out inside the engine.

When the temperature of the engine reaches more than 85 degrees, it will be turned on, the hot water in the engine is pumped into the water tank, and the cold wind blows through the water tank when the car is driving, taking away the heat, and the heat exchange is carried out to cool down the engine.

It can be seen that the thermostat is an important part of the engine to control the water temperature, and it is a device that turns off and opens the large circulation of engine coolant. A malfunction of the thermostat can cause the main valve to not open or close properly.

When the thermostat cannot be turned on normally, the engine cannot start the large circulation, and the overheated coolant cannot enter the water tank, which makes the engine temperature too high; At this time, the coolant temperature and pressure are high, which can easily cause damage to the small circulation system, such as gaskets, heater water tanks, and some water pipes.

When the thermostat cannot be closed normally, the cooling system of the car has been in a state of large circulation since the cold start. The water temperature rises slowly, especially in winter, and hot cars can be extremely slow. The water temperature is low, and the signal provided by the water temperature sensor to the ECU will increase the amount of fuel injected into the engine, and the car will naturally consume fuel.

The problem of thermostat failure mostly occurs in the cracking of the thermostat body or the aging of the rubber pipe, the cracking of the thermostat, and the cooling water.

Improper circulation will cause the water to boil with an increase in temperature. Don't underestimate this widget, once damaged, it can easily cause a big failure. Generally, the thermostat is not a big problem to use for more than 50,000 kilometers, and the thermostat is generally not expensive, and it is relatively simple to replace.

It is not difficult to judge whether the thermostat is damaged, and the owner can identify it by himself.

If the water temperature on the car is slower than before, there may be a problem with the thermostat or water temperature sensor.

1. If the thermostat is not closed tightly, the coolant that should flow in a small circulation state will jump into the large circulation pipeline, and in this state, the rising speed of the water temperature will inevitably be affected to a certain extent. In other words, the larger the gap in the thermostat, the less likely the water temperature will rise. Improving the function of the thermostat is the most effective, second, the vehicle has a warm-up process after starting, the phenomenon of the water temperature rising very slowly is that the engine is warming up, the length of this time is determined according to the water temperature sensor.

3. Some improper operations can also lead to slow rise of water temperature or poor heating effect.

Tips: If the air conditioner heater function is turned on, it will slow down the rate at which the water temperature rises. The windshield defogging function can automatically activate the air conditioning and cooling function, which will inevitably have a certain impact on the heating air**.

The function of the thermostat is to automatically adjust the amount of water entering the radiator according to the temperature of the cooling water, and change the circulation range of the water to adjust the heat dissipation capacity of the cooling system to ensure that the engine works within the appropriate temperature range. The thermostat must be kept in good technical condition, otherwise it will seriously affect the normal operation of the engine. If the main valve of the thermostat is opened.

The vehicle has a warm-up process after starting, the phenomenon that the water temperature rises very slowly is that the engine is warming up, the length of this time is determined according to the water temperature sensor's perception of the water temperature, if there is no problem with the water temperature sensor, it may be that the thermostat always carries out a large cycle to cause the water temperature to rise relatively slowly, mainly check the following two aspects (in the case of landing, the temperature difference between the radiator water inlet pipe and the outlet pipe can be judged whether it is a thermostat problem). Or go to the 4S store for inspection.

The reason why the engine water temperature is too low is generally that the thermostat cannot be turned off due to damage to the thermostat, or that the cooling fan is faulty and in a state of constant rotation. When the thermostat valve fails to close, the coolant is always circulating and the water temperature of the engine will drop quickly.

The thermostat is actually a control valve that controls the circulation of coolant in the cooling system, whether it is a large cycle or a small cycle. The large circulation refers to the route in which the coolant flows when the thermostat is turned on. The small circulation refers to the route of cooling flow when the thermostat is not opened.

If the water temperature is too low, it may be that the thermostat has been turned on and the coolant has been circulating too much, causing the water temperature to drop.

If the water temperature of the car's engine can rise to normal temperature, it means that there is no problem. If the engine water temperature rises slowly, it may be because of a problem with the thermostat.

If the engine water temperature is abnormal, the first thing to check is the thermostat, because the thermostat is a valve that opens and closes the engine cycle, and the purpose of the small cycle is to make the engine water temperature rise quickly.

When the thermostat can not be turned on normally, it will cause the engine water temperature to be abnormal, and when the thermostat is turned on too early or even stuck in the normally open state, it will bring the problem of slow rise in water temperature, and the engine has only one large cycle in the working process, so the water temperature cannot be raised for a long time.

In addition, the water temperature of the engine is displayed on the dashboard of the car. If the water temperature sensor fails, the water temperature balance pointer on the dashboard may indicate the wrong water temperature, and the water temperature sensor will be disconnected or virtually connected.

It could also be that there is a problem with the cooling fan. The role of the cooling fan is to accelerate the cooling of the radiator. If the cooling fan fails, the water temperature of the engine will rise slowly. In this case, it is advisable to check the wiring of the cooling fan.

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