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How to Determine if a Car's Air Conditioning is Low on Refrigerant?

2 Answers

Adriel

07/29/25 7:55am

Methods to determine if a car's air conditioning is low on refrigerant: 1. During normal continuous operation of the air conditioning, if there are continuous bubbles in the sight glass, it indicates a lack of refrigerant; 2. Open the car hood and check for oil stains at the air conditioning system joints—if present, it indicates a lack of refrigerant; 3. During normal continuous operation of the air conditioning, if there are no bubbles in the sight glass, but brief bubbles appear when the air conditioning stops, it indicates the refrigerant level is normal. The process of refilling air conditioning refrigerant is: 1. Evacuate the system, close the manual valves on the pressure gauge and the high and low pressure manual valves; 2. Connect one end of the hose to the injection valve fitting of the refrigerant can; 3. Open the refrigerant can, loosen the nut on the pressure gauge hose to allow some gas to escape, then close it; 4. Open the high-pressure side manual valve and invert the can; 5. Inject the specified amount of liquid refrigerant, then close the refrigerant injection valve and the high-pressure manual valve.

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Corinne

08/12/25 11:10am

I notice that the most obvious sign of poor air conditioning performance in summer is the reduced cooling effect, where the cabin temperature doesn't drop even after running for half an hour, leaving it stuffy. I conduct some simple tests: feel the air vents while driving—if the airflow is normal but there's no cool air, it might indicate insufficient refrigerant; listen for abnormal clicking sounds or frequent cycling of the compressor, which suggests it's under heavy load; also check if the AC light is flashing. This becomes particularly noticeable in hot weather, affecting driving comfort and even safety, such as increasing the risk of heatstroke during long trips. Regular checks are crucial to prevent worsening into system damage or increased fuel consumption. Getting a professional inspection at a shop early is the most reliable solution.

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