What are the weird failures that novices often encounter?

The headlights are delayed and turned off. Many new car owners do not understand their vehicles. When they turn off the engine and get out of the car, they find that the headlights are still on, thinking that they are not turned off. In fact, they have been turned off. The exhaust pipe drips water and emits white mist. I believe many novices will have questions about this problem. Especially in winter, after driving for a period of time, the exhaust pipe will flow down a large puddle of water on the ground, and when you get off the car, you will see white fog on the exhaust pipe. fog.

The engine hood and fenders are very hot. Many car owners feel the hood and front fenders are very hot after driving for a while, thinking that there is something wrong with the engine. The reason is that even after driving for a short time , the engine will also generate a lot of heat when working, and the heat will be transferred, so the hood and front fenders will feel very hot. As long as the cooling system such as the water temperature gauge is working normally, there will be no impact on this. Car owners are reminded to check the coolant level regularly and keep it at least above the minimum value (MIN).

Novice car owners will find that the air conditioner is not cooling when idling, especially when the car is started, and mistakenly think that the air conditioner is broken. In fact, this is because the engine speed is proportional to the car air conditioner compressor speed. When the engine is idling, due to the low speed, the car air conditioner compressor speed is also correspondingly low. At this time, the air conditioning system is in a low pressure state, and the expansion valve opening is It will be relatively small, and the flow into the evaporator will also be small, resulting in less heat exchange by the evaporator. At this time, you will feel that the air conditioner is not cooling or the cooling effect is poor. In the same way, when accelerating, the speed increases, the low pressure decreases, the opening of the expansion valve increases, the flow increases, the heat transfer rate of the evaporator increases, and the cooling effect also increases.

The steering wheel was locked and I didn’t even know that the mechanic gave Ms. Liang detailed instructions. When encountering this kind of problem, be sure not to twist the key too hard to prevent the key from breaking. The correct way is to twist the steering wheel slightly while turning the key to unlock. He said that while the car was driving, he kept hearing the "ding, ding, ding" sound of the vehicle alarm. I didn't feel confident enough to drive, so the car was parked in the emergency parking area. I found that the handbrake light was on. Check under the handbrake lever. It turned out that there was a napkin box. Do not put some irrelevant things in key parts of the car, which will affect the operation of the vehicle.