Air conditioning system diagnostics begins with a visual assessment of the device, which allows detecting mechanical or other damage. Diagnostics continues with the help of a freon leak detector, which finds microcracks through which freon leaves the air conditioning system. Moreover, the system leaks can be detected when refueling the air conditioning system. Further examination involve the assessment of the compressor’s efficiently, checking the state of the electrical components of the air conditioning system of the car's passenger compartment, including all sensors, fans and electric couplings.