How to Add Freon to a Car?

1 Answers
Brown
07/30/25 9:26am
Here are the steps for adding Freon refrigerant via the high-pressure side: 1. After the system is vacuumed, close the high and low pressure manual valves on the manifold pressure gauge. 2. Connect one end of the middle hose to the refrigerant canister injection valve. Open the refrigerant canister valve, then loosen the nut at the end of the manifold pressure gauge hose to allow gas to escape for a few minutes, then tighten the nut. 3. Fully open the high-pressure side manual valve and invert the refrigerant canister. 4. Inject the specified amount of liquid refrigerant from the high-pressure side. Close the refrigerant canister injection valve and the high-pressure manual valve on the manifold pressure gauge, then remove the gauge. When adding refrigerant from the high-pressure side, ensure the engine is off (compressor not running) and do not open the low-pressure manual valve on the manifold pressure gauge to prevent hydraulic shock.
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