How to Replace Refrigerant in a Car?
2 Answers
The steps for replacing refrigerant in a car are: 1. Connect the manifold gauge set to the system service valves and the refrigerant canister; 2. Use refrigerant to purge air from the connecting hoses; 3. Tilt and invert the refrigerant canister on a scale and record the initial weight; 4. Open the valve on the refrigerant canister, then slowly open the high-pressure manual valve to allow refrigerant to flow into the system. When the scale indicates the specified weight, quickly close the refrigerant valve. Car refrigerant, also known as coolant, is the working fluid used in refrigeration and air conditioning systems to transfer heat and produce cooling effects. It can be classified by working method as primary or secondary refrigerants, and by material properties as natural or synthetic refrigerants.
With ten years of experience in car repairs, replacing refrigerant is a routine task in air conditioning maintenance. The first step is to safely extract the old refrigerant using a dedicated recovery machine to prevent leaks that could pollute the environment. Then, carefully inspect the entire system for any leaks, such as loose connections or pipe cracks, and repair them if necessary. Next, use a vacuum pump to evacuate the system for at least half an hour to remove moisture and air bubbles, ensuring the system is dry. Finally, inject the new refrigerant, precisely controlling the amount according to the vehicle's manual, and wear protective gear during the operation. The entire process is highly technical and requires professional equipment—attempting it yourself carries high risks and can easily lead to accidents. I recommend visiting a certified shop as soon as the air conditioning feels ineffective to avoid discomfort while driving and unnecessary fuel consumption.
