Performed preferred customer air conditioning cleaning. Cleaned the condenser checked the electrical. Cycled the air conditioner. Checked the refrigerant levels. Found that the unit is low on r22 refrigerant. Recommended a second opinnion. Customer will call us if they want some options. The air conditioner is 17 years old. Average life of an air conditioner is 14 years. Unit failure is expected. The air conditioner is cooling at this time.