Easy DIY Car AC Gas Check for Cool Air
Easy DIY Car AC Gas Check for Cool Air

Easy DIY Car AC Gas Check for Cool Air

18/02/2025
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Anh Tuan, a veteran truck driver in Hanoi, once shared a memorable story with me. One day, he was assigned to transport goods from Ba Dinh district to Hai Duong province. It was a scorching summer day, the sun blazing down. As soon as he got into his truck, he turned the AC on full blast, but instead of cool air, only hot air gushed out. His Howo truck instantly turned into an “oven,” sweat pouring down him, feeling like he was about to burst into flames.

Anh Tuan was shocked to realize that his truck’s AC had run out of refrigerant. Luckily, he quickly pulled into a garage on Nguyen Van Linh street to check and refill the gas. Since then, he learned his lesson and regularly checks his AC gas to avoid such “fiery” situations again.

Anh Tuan’s story reminded me of the importance of checking car AC gas. So, how do you know if your car’s AC has enough refrigerant? Let’s find out in this article!

How to Check Car AC Gas

Checking car AC gas is not as difficult as you might think. Here are some simple ways you can check it yourself at home:

1. Check by Sensation

  • Turn on the AC to the coldest setting and set the fan to the highest speed. If after a while, you feel weak cool air or no cool air at all, your car’s AC is very likely low on refrigerant.
  • Touch the two AC gas lines. When the AC is working, the low-pressure gas line should be cold, and the high-pressure gas line should be hot. If the low-pressure gas line is not cold or only slightly cold, it also indicates that your AC may be low on refrigerant.

2. Check with a Manifold Gauge Set

This is the most accurate way to check. You can buy a manifold gauge set at auto parts stores. Then, connect the gauge to the low-pressure service port of the AC system and check the pressure. The standard gas pressure is usually indicated on a sticker in the engine compartment or in the vehicle’s owner’s manual.

Checking car AC gas with a gaugeChecking car AC gas with a gauge

Car AC Gas Refill Price Chart

Car AC gas refill prices can vary depending on the type of vehicle, type of refrigerant, and service center. Below is a reference price chart:

Vehicle Type Refrigerant Type Price (VND)
Sedan R134a 300,000 – 500,000
Pickup Truck R134a 400,000 – 600,000
Truck R134a 500,000 – 800,000

Notes When Checking and Refilling Car AC Gas

  • It is recommended to check and refill car AC gas periodically, about every 6 months or when you feel the AC is not working effectively.
  • Choose reputable service centers equipped with modern machinery and experienced technicians.
  • Avoid self-refilling AC gas at home if you do not have sufficient knowledge and specialized tools.

Frequently Asked Questions

1. What are the consequences of car AC running out of gas?

Running out of AC gas will cause the cooling system to stop working, causing uncomfortable heat, especially in the summer. In addition, it also affects the engine and lifespan of the AC system.

2. What causes car AC to run out of gas?

There are many reasons why car AC runs out of gas, such as: leaking gas lines, faulty seals, faulty expansion valves, etc.

Leaking AC gas line in a carLeaking AC gas line in a car

3. What type of refrigerant should I choose to refill my car AC?

You should refer to your vehicle’s owner’s manual or ask a technician to find out the appropriate type of refrigerant for your car’s AC system.

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Conclusion

Checking car AC gas is necessary to ensure the AC system operates effectively, providing you with comfort and safety while driving, especially on hot summer days. Hopefully, this article has provided you with useful information on how to check car AC gas. If you have any questions, please leave a comment below, Xe Tai Ha Noi will help you answer them.

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