1. Remove the radiator grille.
2. Start the engine and let it idle.
3. Turn on the air conditioner and set the fan switch (indicated by the arrow) to position 3.
4. Observe the condition of the liquid through the viewing glass; after 10 seconds of air conditioner operation, it should flow without bubbles. The presence of bubbles indicates a lack of liquid and low efficiency of the air conditioner. If immediately after turning on the air conditioner, no air bubbles appear at all, this indicates too little liquid in the system. It is necessary to immediately turn off the air conditioner to prevent compressor failure and contact a service station to fill the system.
An air conditioner can lose up to 100 g of refrigerant per year due to operational leaks, so it is necessary to periodically refill the system.