How to Refill Car Refrigerant?
2 Answers
Refilling refrigerant can be done from either the high-pressure side or the low-pressure side. High-pressure side refilling involves adding liquid refrigerant, which is suitable after leak detection and vacuuming. Note that the compressor must not be turned on during this method, the engine should be off, and the refrigerant can must be inverted. Here is additional information: Low-pressure side refrigerant refilling method: First, connect the manifold gauge set to the compressor and the refrigerant can. Open the refrigerant can, loosen the nut on the middle injection hose connected to the manifold gauge set until you hear the sound of refrigerant vapor flowing, then tighten the nut to expel air from the injection hose.
Last time I added refrigerant to my car by myself, and the steps must be clearly remembered. First, wear protective goggles and gloves, then locate the high and low-pressure pipe connections of the AC system—the high-pressure pipe is usually thinner. Make sure to buy the refrigerant model recommended by the manufacturer and never mix different types. Next, use a pressure gauge to check the system's existing pressure; if it's normal, no refill is needed. If the pressure is too low, invert the refrigerant can and screw it tightly onto the dedicated adapter. Start the engine and turn the AC to maximum airflow. Then, slowly open the valve while keeping an eye on the pressure gauge needle—make sure it doesn’t exceed the green zone. After filling, close the valve first before stopping the engine, and finally, use soapy water to check for leaks at the connections. The entire process must be done in a well-ventilated area since refrigerant gas is harmful to humans. DIY refilling may save money, but improper operation can damage the compressor. If you're unsure, it’s safer to let a professional handle it.
