Damaged And How To Fix Car Air Conditioning System

Damage and How to Fix Genuine Car Air Conditioning System Garage Thanh Phong Auto Hcm 2024
Latest update date: February 18, 03

An air conditioning system (AC) is a must for cars today. The main effect of the air conditioner in addition to helping the air flow inside the closed cabin also control the temperature and reduce the humidity in the air, helping the car user to be more comfortable and avoid germs. sick.

How to Repair Car Air Conditioning System Damage
How to Repair Car Air Conditioning System Damage

Thanh Phong Auto would like to introduce the principle of operation of the air-conditioning system in popular cars such as Toyota, Mitsubishi, Ford, Honda, Chevrolet, Nissan or high-class Mer, Bmw, Lexus, Audi…. the common damage and how to fix it

Working principle of air conditioning system

The principle of operation can be summarized into the following steps: First, the compressor, connected to the engine via a belt, draws the refrigerant in the gas form (from the gas tank) and compresses it at pressure. high. When compressed, the refrigerant temperature rises and it is pushed to the heater, located at the front of the car, near the grille and has its own fan. In hot rigs, due to the heat dissipation at high pressure, the refrigerant turns into a liquid and switches to expansion valves (or throttle valves).

Operating Principle of Car Air Conditioning System
Operating Principle of Car Air Conditioning System

Next, at the throttle valve, the pressure drops suddenly so the refrigerant vaporizes and moves to the indoor unit. Here, it draws heat from its surroundings and causes the temperature to drop. Cold air will be blown into the cabin by the fan. The wind blowing from an indoor unit can be either external (external cooling), cabin wind, or both.

+ Note: Repair and Maintenance System Car Ruler

Basic structure of AC . air conditioning system


Basic Structure of Ac Air Conditioning System

Basic structure of AC . air conditioning system

Automotive compressors (cold compressors) are the details that affect the most important operation in the air-conditioning system:

  • Create suction or create pressure reducing conditions at its inlet to recover hidden heat of refrigerant vapor from evaporator. This pressure relief condition allows the expansion valve or throttle to regulate the amount of liquid refrigerant to be sprayed into the evaporator.
  • Increasing refrigerant vapor pressure and temperature many times higher than ambient temperature helps to perform well the exchange process at the hot rig.
  • The refrigerant pump runs throughout the system.

The reasons that can lead to compressor damage include: compressor must always operate at large load, lack of lubricant, cold gas does not guarantee quality ....

Hot gantry

The hot rig consists of radiator tubes and wings, and is fitted in front of the radiator. The hot rig uses a fan to reduce the high temperature, high pressure of the refrigerant compressed by the compressor.

The hot rig is responsible for converting the vapor refrigerant into a high temperature, high pressure liquid refrigerant (both steam and liquid gas).

Car Air Conditioning Heater
Car Air Conditioning Heater

In some models, the outdoor unit will be installed in front of the engine room. Therefore, when washing the car, the owner only needs to ask the person to clean the outdoor unit with water or with specialized chemicals.

+ Proposal: Cause, How To Fix Car Air Conditioner Blowing Hot Air


The evaporator evaporates a mist-shaped refrigerant refrigerant with low temperature and low pressure provided by the throttle valve, so it will absorb the heat of the air around the indoor unit. The main damage in cold rigs is mainly air leakage, air filter clinging to dirt, ...

Car Air Conditioning Refrigerator
Car Air Conditioning Refrigerator


The throttle adjusts the amount of refrigerant injected and the unit, depending on the temperature in the vehicle. The residue sticking to the throttle tube for a long time will lead to a blockage in the system.

+ Proposal: Cause of Air Conditioner No Wind Coming Out

Squirrel cage fan

The squirrel cage fan is responsible for bringing cold air from the indoor unit into the cabin. Depending on the design, the position of the air vents of each model, the squirrel cage fan is arranged by the car manufacturer with different numbers.

Dry filter

Dry filter (dehumidifier) ​​has the effect of removing water vapor in the medium, avoiding freezing water into crystals that destroy the system. In addition, the dry filter also has a filter that helps keep possible contaminants in the system. When the filter does not retain moisture, it is necessary to replace the filter to stabilize the system.

In the case of compressor replacement (cold cyclone), to ensure safety conditions for the whole system, extend the life of the cyclone, Thanh Phong Auto recommends that you also replace the capillary tube, dehumidifier and the whole rig.

Major failures on refrigeration systems

In the summer, the car air conditioning system is often used, so there are often abnormal incidents that make people not feel comfortable in the hot, stuffy atmosphere.

The environmental impacts affect the air conditioner.

Damp, dirt, air, rubber, metal debris and the wrong type of lubricant cause blockage, acid formation and reduce the cooling performance of the air conditioner.

Here, Thanh Phong Auto would like to give some main damage and ways to fix it on the car air conditioning system.



How to fix

Air conditioner indicates wind, not cold


- Lack of gas. If the amount of gas is not enough, the machine will only have wind, not cold or very weak cold.

- The air filter is dusty.

- Gas pump, if not all, you need to remove the entire system to find the cause of the leak.

- Clean the air filter.

AC interrupts continuously


The gas pressure in the system is higher than the manufacturer's recommendations. When the system automatically detects abnormal pressure, the system will disconnect the air conditioner clutch to protect other parts of the system.

Need to replace the new control valve, check the inlet sensor, which sensor should be replaced immediately.


Cold cling tape in car air conditioning system.


The air conditioning system is severely lacking of cold gas, the pressure in the tanks sharply decreases, leading to a significant reduction in the boiling temperature of the gas in the blown air, which will be frozen on the surface of pipes and openings. radiator leaves of the orchestra.



Please clean, maintain, vacuum thoroughly, then add new gas.


The air-conditioning system works normally but has an unpleasant odor.

Because the cool ventilation system into the cabin (including the indoor unit, air filter, blower, air inlets and temperature sensor of the indoor unit) has become dirty or malfunctioning. Because car users leave the cabin dirty for a long time with impurities such as sweat, garbage, cigarette smell, perfume, food smell ... in the corners of the car interior. When the air conditioner operates and draws air into the cabin, those impurities will be discharged.


It is necessary to clean the cabin of the car, cleaning the air filter with specialized interior cleaning chemicals. Air conditioning filters need to be replaced after every year or after years of installation.


The system leaked air, in the car only slightly cool


Because the vacuum process is not reached or the vacuum machine is weak, or when the gas is loaded, the air enters into the inside.


This phenomenon you need to drain the gas, vacuum thoroughly. If this problem is not fixed quickly, the oil will be degraded, the concentrate will no longer be able to lubricate and damage the machine.


Damaged air compressor, condenser valve block. The car does not have cool air. Discharging the gas smells and the oil turns dark.



Due to a broken compressor (cylinder, worn-out piston creates gaps in the piston and cylinder, causing the phenomenon of not compressing enough pressure). In addition, the error is also caused by the stuck control valve, always open (high pressure chamber connected to control room).

Need to replace compressor with or head case, the latter need to replace the condenser. In addition, when replacing the compressor, you need to replace the gas filter, cleaning the system to remove residue, oil inside, vacuum and gas intake.


Some signs appear on the gas control glass:


Milky white like milk.

There is water in the system.




Please clean, maintain, vacuum thoroughly, then add new gas, new oil.




Occasional bubbles or floating bubbles

Lack of refrigerant (gas) or dehumidifier does not keep warm.


Vacuum carefully, pump refrigerant (gas), change filter.

There are stripes of oil on the glass.

The system is free of refrigerant (gas).


Refrigerant pump (gas)

>>> Suggestions for reference: Tips to save gas when using car air conditioner

Thanh Phong Auto gives some notes when using air conditioners

- You should turn on the A / C switch when the car has started the engine and turn it off before disconnecting the engine, otherwise it will damage the battery.

Damage and How to Fix Genuine Car Air Conditioning System Garage Thanh Phong Auto Hcm 2024
- Should check and close the door when turning on the air conditioner and do not turn on the high cooling mode as soon as the car is moving, otherwise it will waste fuel and waste cold air out.

Damage and How to Fix Genuine Car Air Conditioning System Garage Thanh Phong Auto Hcm 2024

- Need to adjust the most appropriate air-conditioning temperature compared with the current outside temperature.

– Normally you should let the fan take the outside air so that the car has oxygen, you should only get the wind while turning on the A/C so that the air inside is quickly cooled. Currently, some new cars have an automatic setting mode, after 5 minutes of taking the inside air, it will switch to the outside air intake mode.

In addition, the sensor can detect polluted air when passing through dusty areas, and will automatically switch to clear air. If your car does not have an automatic air intake setting, or has automatic but the sensor does not detect an unpleasant odor, you must automatically switch when needed.

You should periodically maintain your air conditioner on time at service workshops and professional garages to ensure that your car's cooling system is always working in the best condition. See details at:Instructions for using the car air conditioner properly"

Damage and How to Fix Genuine Car Air Conditioning System Garage Thanh Phong Auto Hcm 2024

Damage and How to Fix Genuine Car Air Conditioning System Garage Thanh Phong Auto Hcm 2024

These are the shares that Thanh Phong Auto wants to send to the car users with the desire that the car users will better understand how the air conditioning system works in the car, and know how to maintain and repair damage. of that system.

Contact us for advice and support when encountering the above symptoms! Thanh Phong Auto is proud to be one of top reputable car repair service in Ho Chi Minh City be trusted by customers.

You are viewing the article Damaged And How To Fix Car Air Conditioning System in the category Car Care in Thanh Phong Auto. All reviews about service quality at Thanh Phong Auto please leave a comment right below the article. Don't forget to check out other great posts at Thanh Phong and share it with everyone!

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5 Commentary

  • Huynh Tan Viet 01/06/2020

    2013 altis on the road were blocked AC air conditioner lights are not available, but running about 10km into the garage refrigeration check everything is normal, air conditioning is normal,
    Please advise this case.
    Thank you .

    • Miss Hue 24/06/2020

      Hi, you. This symptom is not clear, there are many causes, a follow-up test and a garage check back.

  • Nguyen decided 29/07/2020

    In my car, there is a lot of water flowing out but not deep cold. 16 degree heat clamp please ask the cause

  • Very useful article. I want Thanh Phong to advise: my car Honda City in 2017 has run 3 km, now there is a phenomenon that the air conditioner still works normally, but the water clings to the cold air conditioner, even though I have entered the test class. and clear the drain. Thank you for consulting Thanh Phong

  • Dang Dinh Hai 17/09/2021

    Inova2017 car for about 2 months did not start the engine, the car was not cold before, the air conditioner was still working normally, please tell me if it is out of gas

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