How to Add Refrigerant to a Car?
2 Answers
Methods for adding refrigerant to a car: High-pressure side filling of liquid refrigerant is suitable for adding after leak detection and vacuuming. Note that this method must not involve turning on the compressor, the engine must be off, and the refrigerant can should be inverted; Low-pressure side filling involves gas, characterized by slower filling speed, and is typically used for replenishing refrigerant. Car refrigerant, also known as car air conditioning refrigerant or commonly referred to as Freon, is a substance that lowers the temperature of the air inside the car. The refrigerant continuously circulates in the cooling system and achieves cooling through changes in its own state.
When I first started learning to drive and the AC wasn’t cooling, I thought about adding refrigerant myself. The steps aren’t too complicated, but safety comes first: turn off the engine and AC system, locate the low-pressure port labeled "L" in the engine bay, and wear gloves and goggles to prevent refrigerant frostbite. Connect the refill tool to the port and purge the air from the lines for a few minutes to let bubbles escape. Then, slowly open the refrigerant canister and pour it in while monitoring the pressure gauge to keep it between 25-30 PSI—exceeding this can damage the compressor. My first time, I added too much due to inexperience, leading to costly repairs, so stick to the manual’s recommended 250-350 grams. After refilling, start the car and test the AC airflow to see if it cools. If not, there might be a leak requiring inspection or a trip to the mechanic—beginners often make mistakes. Trying to save money carries risks, especially when working in summer; ensure proper ventilation to avoid suffocation.
