How to Deal with White Smoke Coming from the Car Hood?

2 Answers
ChristianAnn
09/05/25 8:14am
The methods to deal with white smoke coming from the car hood are: 1. Find a safe place to park and let the engine idle to continue cooling; 2. Check if there is water leakage under the car; 3. Turn off the engine after the temperature gauge pointer drops to a suitable position; 4. Use a wet towel to cover the radiator cap and open the first switch. After the steam pressure is released, fully open the radiator cap and check the water level in the radiator and whether the fan belt is abnormal. The reasons for white smoke coming from the car hood include: 1. In winter, the engine temperature is too low, producing white smoke, as the exhaust gas condenses into water vapor when it meets cold air, which is a normal phenomenon; 2. If the piston is damaged, the engine will start burning oil and emit a large amount of exhaust gas, which contains a lot of water vapor, leading to the appearance of white smoke; 3. Using low-quality gasoline with excessive water content, causing a large amount of water vapor to be emitted and condense into white smoke when it meets cold air.
Was this review help?
4
2
Share
EzraRose
09/17/25 8:25am
Having driven for decades, I've encountered the situation where white smoke emerges from the front hood several times. This usually indicates a cooling system issue, such as a leaking radiator or burst pipes, with the white smoke actually being steam. When handling this, the top priority is to safely pull over and turn off the engine. Don't rush to open the hood immediately, as the high temperatures can easily cause burns. Wait about ten minutes for the car to cool down, then carefully check the coolant level. If the level is low, it might indicate a leak. You can temporarily add water or coolant as an emergency measure, but don't drive too far—head to a repair shop as soon as possible. During regular maintenance, pay extra attention to the cooling system and change the coolant periodically to prevent issues. Remember, never force the car to keep running when smoke appears—the risks are too high. Safety always comes first.
Was this review help?
11
4
Share
Expand All
More Forum Discussions

What is the Difference Between an Air Filter and a Cabin Air Filter?

There are the following differences between an engine air filter and a cabin air filter: 1. The cabin air filter is installed near the air conditioning intake, specifically behind the blower motor, and is used to filter the quality of air entering from inside or outside the vehicle. 2. The engine air filter refers to the engine intake system, which filters the air entering the engine intake pipe. Their functions are different. Generally, the replacement cycle for the engine air filter is based on air quality and mileage, while the cabin air filter is typically replaced once a year or every 20,000 kilometers. 3. To access the engine air filter, open the vehicle's front hood. It is usually located on the right side facing the engine. Simply use a screwdriver to remove the fixing screws on the air filter box to see the air filter. 4. To access the cabin air filter, open the glove compartment on the passenger side, remove the cover plate, and you will find the cabin air filter. 5. The cabin air filter filters the air entering the cabin from outside, improving air cleanliness by removing impurities and other particles. This provides a good air environment for passengers and protects their health.
19
5
Share

What are the signs of a faulty front oxygen sensor?

When the front oxygen sensor fails, the ECU cannot obtain information about the oxygen concentration in the exhaust pipe, and thus cannot perform feedback control on the mixture concentration. This leads to increased fuel consumption and exhaust pollution, and the engine may exhibit symptoms such as unstable idling, misfiring, and surging. Here is some additional information about the front oxygen sensor: 1. The main function of the front oxygen sensor is feedback. Simply put, it detects the oxygen content in the exhaust gas produced after the combustion of the air-fuel mixture in the cylinders. Generally, a high oxygen content indicates a lean mixture, while a low oxygen content indicates a rich mixture. The front oxygen sensor sends different electrical signals to the ECU based on the oxygen content, allowing the ECU to adjust the mixture accordingly. 2. The exhaust gas produced by the car's combustion must pass through the catalytic converter for purification before being released. The rear oxygen sensor detects the oxygen content in the purified exhaust gas and feeds it back to the ECU. The computer then compares the data from the front oxygen sensor. If the data from the front and rear oxygen sensors are the same, it can be concluded that the catalytic converter has failed.
10
4
Share

How to Perform Pressure Testing on a Car Air Conditioning System?

Here’s how to perform pressure testing on a car air conditioning system: 1. Check the pressure in the car: First, rotate the needle valve on the DIY refill hose opener counterclockwise to its highest position, then screw the refrigerant can into the opener and tighten it. 2. Locate the low-pressure port: Typically, there’s a small blue or black cap under the hood on the left side with an "L" marked on it. Unscrew this cap. 3. Start the car engine and turn on the AC switch, setting the blower to maximum. Wait for three minutes, then connect the DIY hose to the car’s air conditioning low-pressure port. 4. Once the DIY hose is connected to the low-pressure port, the pressure gauge on the DIY hose will immediately show a reading. 5. At this point, the refrigerant refill for the car’s air conditioning system is complete. Simply tighten the "L" cap.
16
1
Share

What is the best method to judge the distance between vehicles?

Methods for judging the distance between vehicles are as follows: 1. Determine the distance of the rear vehicle to assess whether a lane change is possible. Observe how far the vehicle in the adjacent lane is located behind the side of your vehicle, typically using the side rearview mirrors. When using the rearview mirror to judge the distance, first adjust the vehicle seat and the angle of the rearview mirror. If the body of the rear vehicle has entered the danger zone to the left of the dotted line in the rearview mirror, it indicates that the distance between the vehicles is very close, and turning should not be attempted at this time. 2. Since the driver is positioned on the left side of the vehicle, it is more challenging to gauge the situation in the right lane. Moreover, the blind spot in the left side rearview mirror is larger than that on the right. If the rear vehicle occupies half of the rearview mirror's area and only half of its body is visible, it means the rear vehicle is very close to your car. In this case, you should maintain your current lane and avoid changing lanes.
15
1
Share

What are the differences between China 5 and China 6 standards?

The main difference between China 5 and China 6 standards lies in their emission requirements, with China 6 being significantly stricter. The specific differences are as follows: 1. Different emission limits: The China 6 standard imposes 40% to 50% stricter limits compared to China 5. 2. Different decommissioning timelines: For example, while both China 5 and China 6 vehicles purchased in January 2019 may have a 15-year registration period, their actual usage lifespans will differ. 3. Price difference: China 6 vehicles incorporate additional components compared to China 5 models, plus automakers face extra costs from compliance testing, certification, and production changes - making China 6 vehicles substantially more expensive. 4. Different sulfur content requirements: China 5 allows up to 10mg per kilogram, while China 6 permits up to 50mg per kilogram.
7
4
Share

How many more years can a National IV standard car be driven?

Currently, the country has implemented the National VI emission standard for motor vehicles. For National IV standard vehicles, they are only restricted from new registrations without measures like traffic restrictions. How long they can actually be driven still depends on the vehicle's operating condition and mandatory scrapping age. Automotive emission standards regulate the permissible levels of harmful gases emitted from vehicle exhaust, including CO (carbon monoxide), HC+NOx (hydrocarbons and nitrogen oxides), and PM (particulate matter, soot). Relevant information about National IV standard is as follows: 1. The National Fourth Stage Motor Vehicle Pollutant Emission Standard, abbreviated as "National IV Emission Standard" or National IV Standard. 2. Compared to National III standard, National IV requires light-duty vehicles to reduce single-vehicle pollutant emissions by approximately 50%, heavy-duty vehicles to reduce single-vehicle emissions by about 30%, and particulate matter emissions by over 80%.
7
1
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.