Air conditioner on a passenger vehicle is one of the really basic equipment that comes with the bus. However, not all drivers know how to use the air conditioner smartly and safely. Here are some notes to help passenger vehicle drivers use the air conditioner effectively.

Parking at a cool space

To shorten the cooling time of the air conditioner inside the coach bus, drivers should try to find a covered place to park the car. If you cannot find somewhere like that, the ideal location for parking will be under large shady trees. In case of stopping at a vacant lot, the driver should prepare and cover the vehicle with large tarpaulins or specialized sunshades. Not only keep the car cool, these covers also help to make the car’s paint color more durable, while also reducing the possibility that sunlight can affect the quality of the bus’s interior. If possible (taking into account security factors), the driver can leave the window glass ajar by 1-2 cm to allow the air in the car to circulate.

Push the hot air out with the fan

Parking 29-seat buses and 35-seat coaches outdoors for long periods of time in the mid-40 Celsius degree of summer will cause the temperature inside the vehicle to rise and can be as high as outdoor.

To reduce the heat for the passengers, before the passengers get on, as soon as the bus start moving, it is necessary to push the hot air out of the vehicle immediately by start engine, open the door and turn on the fans. This not only helps the air inside be less stuffy, but also avoids some risk of disease for the occupants, because the plastic inside the car is “burned” under high temperature to easily produce benzene – a toxin that is easily carcinogenic. After the air is cooler compared to the outside temperature, the driver then closes the car door. This helps to let the hot air inside the system be pushed out.

Set the right level of the fan

Although using fans to blow hot air out of the door before turning on the air conditioner is a great way to help the air in the car quickly cool down and be comfortable, but it does not mean that turning on the fan at the highest level will make the system of the air conditioner cool in the fastest way.

A study by showed that the air conditioning system achieved the coldest temperature at the average fan level instead of at the highest level. This is also easy to understand because the blower and the air conditioner are sharing the limited electricity power, if the fan is set to the highest level, the performance of the air conditioner is also reduced.

Do not set freeze level of air conditioner

Depending on the number of passengers in the vehicle, the driver should set an appropriate temperature that makes everyone feel comfortable. However, if the air inside is too cool, the gap of temperature difference between the outside and the inside will be too large. That easily cause thermal shock for passengers when getting in and out of the vehicle, especially the elderly, young children or people with medical problem related to blood pressure or heart disease. The recommended temperature level should be in the range of 25-27 degrees Celsius.

Turn off the air conditioning system before turning off the fan system

About 1-3 minutes before the end of the journey, the driver should turn off the air conditioning system on the vehicle, open the glass door slightly, but still maintain the fan system, take the outside air to gradually reduce the temperature difference.

This will not only avoid thermal shock for passengers but also increase the life of the air conditioning system and fan system.

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