Users of refrigerated trucks can freely freeze or heat the goods loaded into the refrigerated compartment to the desired temperature using the refrigeration unit on the refrigerated compartment. Therefore, load goods below the required transportation temperature into the carriage, set the refrigeration unit to the required transportation temperature, and lower or raise the temperature of the goods to the required temperature for some time. But in fact, on the contrary, the temperature of the goods cannot be lowered, but rather the goods are damaged or deteriorated. Because the refrigeration unit in the refrigeration room does not lower the temperature of the goods, but maintains the temperature of the goods. Just like the blankets we use to sell cold drinks and package goods. When external cold (hot) sources enter the carriage through radiation, conduction, and convection, they are carried away by the cold air blown out by the refrigeration unit, isolating the heat source from entering the cargo.

The deterioration of the rust prevention quality of the coolant not only easily leads to damage to the radiator, pipes, hoses and other components in the refrigeration compartment, but also pollutes the environment and air due to the main component of the coolant being ethylene glycol. However, it is difficult to determine whether the coolant has deteriorated with the naked eye, so we should regularly replace the coolant instead of waiting for it to fail. It is generally recommended to replace the coolant every 40000 kilometers or every two years, and to replace the cooling fan belt every two years.

Check the refrigerator battery every two months to ensure there is sufficient battery fluid. If insufficient, add distilled water to the appropriate height. Check the positive and negative contacts of the refrigerator battery once a year for rust or dirt. If there is any, it should be cleaned up in a timely manner to keep the line unobstructed. After battery repair, the scrap time of refrigeration room batteries can be extended, reducing resource waste and environmental pollution caused by waste batteries.

A refrigerated truck is a closed truck used for transporting frozen or fresh goods. Broadly speaking, it refers to specialized vehicles used for transporting rotten goods. It is the main equipment for refrigerated transportation on highways. Refrigerated transportation equipment is divided into insulated trucks, refrigerated carriages, and fresh-keeping trucks.

A vehicle with insulation but no refrigeration device is called an insulated vehicle. The lower limit of the adjustable temperature range in the compartment with insulation is less than -18 degrees, which is called a refrigerated compartment, used for transporting frozen goods. A hot vehicle with a body and cooling device is a fresh-keeping vehicle, with an interior temperature of around 0 degrees, used for transporting fresh goods. Refrigerated compartment=insulated compartment+refrigeration unit+chassis. People's requirements for food preservation are increasing, and the demand for refrigerated food is growing. Cold chain logistics has emerged.

Refrigerated and insulated trucks are mainly used for the storage and transportation of fresh agricultural and sideline products, as well as food and beverages. Due to its other refrigeration and insulation functions, it can meet the preservation and freezing requirements in the refrigerated transportation of fresh food, playing an important role in cold chain vehicles and becoming an important link in cold chain logistics.