Why is there water leaking under the car?

1 Answers
LaReid
07/30/25 9:37am
Reasons for water dripping under the car: 1. If it occurs after the air conditioning has been running for a while, this is a normal phenomenon. When the air conditioning is operating, moisture in the cabin condenses on the evaporator to form water droplets, which are then discharged outside the vehicle through the drain pan and drain pipe. 2. Check if the antifreeze in the radiator is low. If it is, promptly visit a 4S shop to inspect the cooling system for faults. 3. Water dripping from the muffler and exhaust pipe at the rear of the car is also normal, commonly observed during winter. 4. When gasoline is injected into the cylinder and mixed with air, it undergoes complete combustion in the combustion chamber, primarily producing carbon dioxide and water. The water, in the form of vapor at high temperatures, is expelled into the atmosphere.
Was this review help?
17
2
Share
More Forum Discussions

What Causes No Response When Pressing the Accelerator in a Diesel Electronic Injection System?

Introduction to the reasons why an electronically injected diesel engine cannot accelerate (fails to increase RPM): 1. Clogged fuel line, insufficient fuel supply. 2. Fuel injector pressure relief, rail pressure too low. 3. Common rail pressure relief valve, rail pressure too low. In such cases, it is best to visit a 4S shop for detailed inspection and repair. Additional information: 1. Fuel injection pump: The fuel injection pump is a crucial component of a diesel engine in vehicles. The fuel injection pump assembly is typically composed of the fuel injection pump, governor, and other components installed together as a whole. Among these, the governor ensures low-speed operation of the diesel engine and limits the maximum RPM, maintaining a certain relationship between injection volume and RPM. The fuel injection pump is the most important component of a diesel engine, often regarded as the 'heart' of the internal combustion diesel engine. Any malfunction in it can cause the entire diesel engine to operate abnormally. 2. Governor: A governor is an automatic regulation device that adjusts the fuel supply of the injection pump based on changes in the diesel engine's load, ensuring the diesel engine runs at a stable RPM. Governors have been widely applied in various fields, including industrial DC motor speed control, industrial conveyor belt speed adjustment, lighting regulation, computer power supply cooling, DC fans, and more.
6
0
Share

Is the Driver's License Test Difficult?

If you study diligently and practice driving seriously, you can pass the driver's license test smoothly. The full name of the driver's license is the motor vehicle driver's license, also known as the 'driving license,' which is the certificate required by law for motor vehicle drivers. Currently, there are four subjects in the driver's license test. The content and passing standards for each subject are uniformly set nationwide, and the test sequence follows Subject 1, Subject 2, Subject 3, and Subject 4 in order. You can only proceed to the next subject after passing the previous one. Below are the test contents for each subject: 1. Subject 1 Test Content: Primarily covers basic knowledge such as road traffic safety laws, regulations, traffic signals and their meanings, and traffic rules. 2. Subject 2 Test Content: Includes five mandatory items—reverse parking, parallel parking, stopping and starting on a slope, right-angle turns, and curve driving—with additional items in some regions. 3. Subject 3 Test Content: Covers 16 driving skills, including vehicle preparation, starting, driving straight, shifting gears, changing lanes, pulling over, proceeding straight through intersections, turning left at intersections, turning right at intersections, crossing pedestrian crossings, passing school zones, passing bus stops, meeting oncoming vehicles, overtaking, making U-turns, and simulating lighting conditions. 4. Subject 4 Test Content: Primarily includes safe and civilized driving requirements, safe driving knowledge under adverse weather and complex road conditions, emergency handling methods for situations like tire blowouts, and post-accident handling knowledge. Like Subject 1, it is a theoretical test.
11
3
Share

The RAV4 transmission is CVT, why does it also have MT?

The RAV4 transmission being CVT while also having MT indicates that this transmission belongs to the manual continuously variable transmission function. Below is relevant information about automotive transmissions: 1. Definition: An automotive transmission is a device used to coordinate engine speed and the actual driving speed of the wheels, aiming to bring out the best performance of the engine. 2. Function: The transmission can produce different gear ratios between the engine and wheels during vehicle operation, allowing the engine to operate at its optimal power performance state through gear shifting. 3. Development Trend: Transmission technology is becoming increasingly complex with higher levels of automation, and automatic transmissions will become the mainstream in the future.
16
5
Share

What does 'illumi' mean in a car?

In a car, 'illumi' refers to the background lighting or backlight control. Below is an introduction to related interior lighting features: 1. Indicator lights: The indicator lights on the car dashboard display the working status of various systems, some of which serve as warning lights. When a warning light illuminates, the driver should understand its meaning and respond appropriately. 2. External lighting warning lights: These warning lights are commonly found in German brand vehicles. They illuminate when there is a malfunction in the vehicle's external lighting components. In more advanced models, accompanying text messages may also appear to facilitate timely replacement.
9
4
Share

Is the Mazda Atenza's Engine Imported or Domestically Produced?

The engine of the Mazda Atenza is imported from Japan and is independently developed and manufactured by Mazda. This engine incorporates Mazda's Skyactiv technology. The Mazda Atenza is equipped with two engine models: the PE 2.0L engine and the PY 2.5L engine. The 2.0L engine delivers a maximum horsepower of 158 HP, a maximum power output of 116 KW at 6400 rpm, and a peak torque of 202 N.m. The 2.5L engine produces a maximum horsepower of 192 HP, a maximum power output of 141 KW at 6100 rpm, and a peak torque of 252 N.m. For daily maintenance of the Mazda Atenza's engine, the following methods can be used: Use lubricating oil of the appropriate quality grade. For gasoline engines, select SD to SF grade gasoline engine oil based on the additional equipment of the intake and exhaust systems and usage conditions. For diesel engines, choose CB to CD grade diesel engine oil according to mechanical load, with the selection standard not lower than the manufacturer's requirements. Regularly replace the engine oil and filter. The quality of any grade of lubricating oil will change during use. After a certain mileage, its performance deteriorates, leading to various engine problems. To avoid malfunctions, change the oil regularly based on usage conditions and maintain an appropriate oil level. When oil passes through the fine pores of the filter, solid particles and viscous substances accumulate in the filter. If the filter becomes clogged and oil cannot pass through, it may rupture the filter or open the safety valve, allowing oil to bypass the filter and carry contaminants back to the lubrication areas, accelerating engine wear and increasing internal contamination. Regularly clean the crankcase. During engine operation, high-pressure unburned gases, acids, moisture, sulfur, and nitrogen oxides from the combustion chamber enter the crankcase through the gap between the piston rings and cylinder walls, mixing with metal particles from component wear to form sludge. In small amounts, it remains suspended in the oil; in large amounts, it precipitates, clogging filters and oil passages, making engine lubrication difficult and causing wear. Regularly use a radiator cleaner to flush the radiator. Removing rust and scale deposits not only ensures the engine operates properly but also extends the overall lifespan of the radiator and engine.
12
2
Share

Why Can't You Stay in the Car During a Sandstorm?

The main reason you shouldn't stay in a car during a sandstorm is to prevent the vehicle from being buried by the heavy sandstorm, making it difficult for passengers to rescue themselves. Here are some driving precautions during sandstorm weather: 1. Maintain a safe distance: Avoid tailgating during sandstorms to allow reaction time for emergencies and prevent dust kicked up by preceding vehicles from obstructing your vision, thereby reducing accidents. 2. Use lights and horn for alerts: During daytime sandstorms, turn on your parking lights and use the horn when necessary to warn pedestrians and other vehicles; at night, use anti-glare low beams to avoid impaired visibility caused by dazzling light screens.
10
2
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.