12
2025
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07
Truck Encyclopedia (5): Is the water temperature still low for half a day in a hot car?
This summer, Lao Wang bought a new car, it is normal to run in summer, the water temperature is not high or low, but after winter, Lao Wang has been in the car for more than 10 minutes, the water temperature is still very low, the warm wind can not come out, and Lao Wang is only shivering.
"Why does the water temperature rise so slowly in my car in winter?" What are the problems caused by the slow rise in water temperature, and what are the reasons for this? With questions, Lao Wang once again found Lao Li and asked this professional for help. Today we will answer these questions for you.
▎ It's not good to be high or low - water temperature
When we say "water temperature", we refer to the temperature of the engine coolant. Engine coolant is the medium that helps the engine dissipate heat, and it ensures that the engine is kept at the ideal operating temperature by circulating it in the cooling system and bringing excess heat from the engine to the radiator for "release".
After the engine is cold-started, it needs to go through a warm-up process, and the water temperature gradually increases, if the water temperature rises too slowly, it means that the engine cannot reach the ideal working temperature for a long time. In this way, there are 3 problems.
● Poor heating effect
This is also the reason why Lao Wang can't stand it the most, because the heat of the car heater also comes from the engine cooling system, and the water temperature of Lao Wang's car rises too slowly in winter, which leads to the delay in the warm air after the start of the vehicle in winter, which is the reason why Lao Wang has been frozen for a long time.
● Increased fuel consumption
Before the water temperature reaches the ideal operating temperature, the oil consumption during this period will be significantly higher than under normal operating conditions due to the relatively high viscosity of the engine and the greater resistance of the engine operation. Veteran drivers must know that fuel consumption during cold starts in winter is much higher than usual.
If the water temperature of the car rises slowly, it will make this process of high fuel consumption longer, and the overall fuel consumption will also rise "howling".
● Increased engine wear
Most of the wear and tear of the engine comes from the cold start stage, because the oil viscosity is highest during the cold start, and the lubrication effect is poor. The slow rise of the water temperature will cause the oil temperature to not rise quickly, and the hot time will be prolonged, which will exacerbate the wear and tear of the cold start, and become a vicious circle.
▎ Understand the problem and prescribe the right medicine
Okay, now that the hazards are clear, let's analyze the reasons for the slow rise in water temperature.
● Thermostat failure
First of all, there is the problem of thermostats. Because the thermostat is a valve that switches the size of the engine, and the purpose of the small cycle is to make the water temperature of the engine can be quickly raised, so that the engine can pass the hot car stage as soon as possible. When there is a problem with the thermostat, it is naturally the problem of water temperature.
When the thermostat cannot be turned on in time, it will lead to the problem of high water temperature. When the thermostat is turned on too early or even stuck in the normally open state, it brings the problem of slow rise in water temperature. Because the engine only has a large circulation at this time, the water temperature cannot be increased quickly. At this time, we need to contact the service station to replace the thermostat as soon as possible.
Exclusion method: Replace the thermostat.
● Cooling fan failure
The function of the cooling fan is to speed up the heat dissipation of the water tank and avoid high water temperatures. But if the cooling fan "pushes too hard", it will bring the problem of slow rise in water temperature. The most common problem is that the fan rotates constantly, which is usually caused by a faulty clutch or line. It is also necessary to contact the staff at the service station to check the repair.
Exclusion method: Replace the thermostat.
● The water temperature sensor is faulty
If the water temperature sensor is faulty and the temperature check is not accurate, then the water temperature indication we see on the meter is likely to be the wrong water temperature display.
For example, if the water temperature sensor has problems such as internal or circuit disconnection and virtual connection, it will cause the water temperature meter to show that the water temperature is low, resulting in the problem that the false water temperature rises slowly or even cannot be raised.
Exclusion method: Replace the water temperature sensor.
▎ Learn skills and drive satisfactorily
After ruling out the water temperature problem, here are a few tips to help cardholders drive more satisfactorily in winter.
● Warm artifact - truck "mask"
As an old driver, especially in the north, you must know that the thermal cover of trucks has been around for a long time. As an artifact of winter driving, the thermal cover installed in the front air outlet of the truck has been a scenic line for winter driving in northern China.
It seems to be a small insulation cover, the cost is not high, but the effect is not small. In the era when silicone clutch fans were not yet widely used and cooling fans were directly connected to the engine, the thermal cover could ensure that the engine heated up quickly after a cold start. It can save fuel, improve the heating effect of the cab, and improve driving comfort.
Even in 2020, there are still many northern cardholders who install thermal insulation covers for their trucks in winter, however, they can indeed increase the rate at which the water temperature rises.
● Don't be irritable – don't turn on the heater right away
When the truck is parked overnight, the whole vehicle is basically completely frozen, and it is not appropriate to turn on the heater in the car as soon as the card friend gets into the car.
On the one hand, the engine is not fully warmed up, the water temperature is low, the fuel consumption is large, and it burns all their hard-earned money.
On the other hand, the engine temperature itself is low, and turning on the heater will slow down the heating speed, and the warmer sent out at this time is not warm, so it is better to be restless, wait patiently for a few minutes, and then turn it on after the water temperature rises.
It is not easy for us cardholders to drive, but after all, the car is a tool, and it is inevitable that there will be some failures. By understanding some of the working principles, you will be more comfortable when driving, and you will be able to find the right medicine for problems and avoid the waste caused by blind spending.
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