{"id":92495,"date":"2023-08-02T13:23:30","date_gmt":"2023-08-02T13:23:30","guid":{"rendered":"https:\/\/www.dubizzle.com\/blog\/cars\/?p=92495"},"modified":"2023-08-02T13:23:32","modified_gmt":"2023-08-02T13:23:32","slug":"car-ac-making-hissing-noise","status":"publish","type":"post","link":"https:\/\/www.dubizzle.com\/blog\/cars\/car-ac-making-hissing-noise\/","title":{"rendered":"Hissing Noise from Car AC: Common Causes and Solutions"},"content":{"rendered":"\n

The comfort of a well-functioning car air conditioning system on a scorching day can be a true blessing. However, there are times when this essential feature of our vehicles can throw us a curveball in unexpected ways. One such issue that many car owners might encounter is the car AC making a hissing noise which indicates a problem in the air conditioning system. <\/p>\n\n\n\n

That said, here are the common causes and fixes of car AC making a hissing noise.<\/p>\n\n\n\n

Causes of Car AC Making a Hissing Noise<\/strong><\/h2>\n\n\n\n

A hissing noise from the car AC is not a major issue. However, if the problem persists, it is an indication of a malfunctioning part, causing car AC failure<\/a>. <\/p>\n\n\n\n

Here are the common causes of a car AC making a hissing noise. Let\u2019s go through them. <\/p>\n\n\n\n

LEAKS IN THE REFRIGERANT LINES <\/strong><\/h3>\n\n\n\n

A refrigerant, also known as Freon, circulates the cool air in the cabin. However, if there is a leak in the refrigerant lines, it will result in the car AC making a hissing noise. These leaks occur due to regular wear and tear and physical damage to the unit, causing small holes or broken seals. Also, due to such leaks, low refrigerant levels cause the car AC to blow hot air<\/a>. <\/p>\n\n\n\n

COMPRESSOR ISSUES <\/strong><\/h3>\n\n\n\n

A bad car AC compressor<\/a> is another reason for a hissing noise. When it is turned on, it will create unusual noises. A compressor may be affected by various factors such as overheating, lack of lubrication or clutch issues. Other mechanical and electrical problems such as imbalance of sensors or solenoids also affect the working of an AC compressor. As a result, car AC only works while driving<\/a>.<\/p>\n\n\n\n

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Compressor issues disturb the working of the AC system, creating unwanted noises<\/figcaption><\/figure>\n\n\n\n

EXPANSION VALVE PROBLEMS <\/strong><\/h3>\n\n\n\n

The expansion valve in a car AC<\/a> also called an orifice tube in some systems, regulates the refrigerant flow into the evaporator. From there, it undergoes a pressure drop, leading to cooling. If the expansion valve is stuck or damaged, it can cause pressure imbalances in the system, resulting in a hissing noise.<\/p>\n\n\n\n

DEBRIS<\/strong><\/h3>\n\n\n\n

The evaporator and condenser are essential components for heat exchange in the AC system. If they become clogged with debris or dirt, it hinders the flow of refrigerant and creates abnormal sounds, including hissing.<\/p>\n\n\n\n

FAULTY CONDENSER FAN MOTOR <\/strong><\/h3>\n\n\n\n

A faulty condenser fan motor can disrupt the proper cooling process in the AC system. This leads to an imbalance in the refrigerant pressure and causes overheating. These issues cause the refrigerant to hiss as it circulates through the AC system. Besides, it is also one of the probable causes of weak airflow in car AC<\/a>. <\/p>\n\n\n\n

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If the condenser fan motor doesn’t work, there will be a hissing noise and a weak airflow from the car’s AC <\/figcaption><\/figure>\n\n\n\n

LEAK IN INTERNAL VALVE <\/strong><\/h3>\n\n\n\n

The internal valves in the car’s AC maintain the refrigerant pressure. If the internal valves are leaked, there will be no cold air. As a result, a hissing sound will be observed. <\/p>\n\n\n\n

OVERCHARGED AC SYSTEM<\/strong> <\/h3>\n\n\n\n

When a car’s AC system is overcharged with refrigerant, it leads to excessive pressure inside the system. This pressure increases and causes the excess refrigerant to escape through small openings or the pressure relief valve. As the refrigerant tries to find a way to release the extra pressure, it creates a hissing noise, audible to the driver or passengers inside the car. <\/p>\n\n\n\n

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An overcharged AC system leads to a disturbance in the refrigerant pressure <\/figcaption><\/figure>\n\n\n\n

Fixes of Car AC Making a Hissing Noise<\/strong><\/h2>\n\n\n\n

We are now familiar with the potential causes of car AC making a hissing noise. Let\u2019s explore different ways to fix this car AC issue<\/a>.<\/p>\n\n\n\n

REPLACE THE LEAKY VALVE<\/strong><\/h3>\n\n\n\n

The hissing noise from the AC will increase with time if the leaky valve is not changed. To so do, you can follow the steps mentioned below:<\/p>\n\n\n\n