Air conditioning systems for buses directly impact passenger comfort, health, and safety. However, due to the complex operating environment and frequent use, various issues often cause cooling performance to decline, or even complete failure. This article systematically reviews common bus air conditioning repair issues and their solutions, combining professional experience with practical tips to provide scientific guidance for operators and maintenance personnel.
After starting the bus, wait approximately 8-15 minutes until the water temperature returns to normal, meaning it reaches the middle mark. Then, turn on the heater. Then, adjust the circulation mode of the Air Conditioner for Buses to recirculate the air inside the vehicle.
Next, switch to warm air mode. Note that some vehicles may display a red area, while others may use a sun pattern. Finally, turn on the AC switch. Adjust the air conditioning position to the appropriate setting.
Note that if a vehicle's heater system doesn't heat properly, there are two possible reasons: one is the engine cooling system, and the other is a malfunctioning heater control mechanism.
This is primarily for vehicles that have been parked overnight. The air inside the closed vehicle is very stale. Consider the consequences of running the AC in recirculation mode. The best practice is to open the windows first, then turn on the external recirculation to remove the exhaust air, then close the windows and turn on the air conditioner. Similarly, if your car has been exposed to the sun for a long time, open the windows and turn on the external recirculation first to remove the hot air, then close the windows and turn on the external recirculation.
AC For Buses A/C Switch
The A/C switch is the air conditioner's compressor switch. Turning it on allows the air conditioner to cool; otherwise, it only blows air. Once turned on, this activates a series of cooling devices. These devices generate moisture as they cool the air, which, combined with the engine's ambient temperature, can cause the air conditioner to produce odors. Therefore, before arriving at your destination, you should turn off the A/C a few minutes beforehand and increase the airflow to allow natural air to dry the ducts and prevent odors.
When it comes to cleaning your car air conditioner, many people have questions: Why should you clean it? What happens if you don't? In fact, when a car air conditioner is running, 80% of the fine dust and bacteria in the air pass through the filter and enter the air conditioner. They then combine with condensation and clog the evaporator, affecting both cooling and heat dissipation. The humid environment and dust on the surfaces of the evaporator and ventilation ducts create a breeding ground for mold and fungi, producing a decaying odor. These odors can spread throughout the vehicle interior when the air conditioning is on and be absorbed into the human body, leading to "car air conditioning sickness." Therefore, cleaning the car air conditioner is essential.
How AC For Buses Work
How car air conditioning works: The compressor pressurizes low-pressure gaseous refrigerant into high-pressure gaseous refrigerant. This gas passes through the condenser, where it cools and dissipates heat, becoming medium-temperature, high-pressure liquid refrigerant. The refrigerant then passes through the receiver-dryer, where it is filtered for moisture and impurities and throttled to become clean liquid refrigerant. The refrigerant then flows to the expansion valve, where it is transformed into fine mist droplets and sprayed onto the evaporator. The blower then blows the cooled air from the evaporator into the vehicle.
How the car air conditioning heating system works: The heating system incorporates a heater tank on top of the cooling system. As the air circulates, the air from the blower passes through the heater tank, raising the air temperature. When the air enters the vehicle cabin, it carries a certain amount of heat, raising the interior temperature. In addition, car air conditioners also have air purification functions. The air purification function uses air filters and electrostatic dust removal devices to filter out dust, pollen, ground particles, some bacteria, soot, ozone, etc. in the air, thereby ensuring clean air enters the car.
