For trouble-free operation of the air conditioner, it is necessary to turn it on even in the cold season. Otherwise, the seals in the refrigerant circulation system will dry out; they will harden and begin to leak. This will lead to the loss of the refrigerant, which also serves as a lubricant.
Note. Recommendation: The air conditioner cannot be repaired by yourself. The only exception is to check the tension of the V-belt. The refrigerant of the air conditioner is composed of fluorine hydrocarbon (FCKW). FCKW destroys not only the ozone layer, but direct work with this substance is also dangerous.