The cooling method of air conditioning is via a rapid evaporation of the refrigerant to absorb the heat, making the air passed cool down rapidly. Due to the low temperature of the evaporator and high temperature of the air, particles of water molecules in the air condense into droplets on the evaporator, so that the dust in the air, tiny fluffy on the seat and some other substances will easily adhere to the surface of the evaporator, which will occur to mold and multiplication of the bacteria. This kind of air will harm human health; Therefore, replacing the air conditioning filter regularly is a must.

When it’s heavy rain, the wipers seem to work very well, but when it’s light rain, the wipers leave uneven traces on the windshield, which will cause poor sight. In this situation means the wipers are hardened. The wipers are moving by the connecting rod through motor rotation power and transmit the force to the wiper arm.

When the wiper rubber is hardened, they can’t fit closely with the glass surface; or the cracks of wiper will cause uneven traces. Changing the wipers is very simple, but with different car models and years, different length of wipers you shall change. Some wipers only need to change the rubber sheet, some need to replace as a whole.

No matter high-end cars, low-grade cars, imported cars, domestic cars, new cars, used cars have varying levels of noise problems. The noise is mainly from the engine, wind, car body resonance, suspension, and tires. When the car driving on the bumpy road, there will be resonance noise; when the windows are opened during high-speed driving, there will be noise when the windows cannot produce resonance. The noise cannot be effectively absorbed due to the narrow space inside the car. In driving, the noise of the suspension system and tires will pass through the chassis and get in the car. The noise is different when there is different suspension, tire brand, tire pattern, and tire pressure; the car shape and driving speed will produce different noise as well. Generally speaking, the higher speed, the bigger wind noise.

There are two situations of engine oil light on: real and unreal. The real one means the pressure is actually low, so the warning light is on and telling us the lubricant system has some problems to be solved. The unreal one means that there is no problem with the lubricant system, but the pressure light is failed. The failed pressure light will not affect the engine operation, but still, we need to find out the reasons. Normally, the pressure light indicates some real problems.