Why is the cold air in Baojun 730 not cooling?

[OGabriel]

There may be several reasons why the cold air in Baojun 730 is not cooling: 1. Refrigerant issues: The car's air conditioning system consists of multiple metal pipes with small gaps between them, leading to slight refrigerant leakage. Additionally, the dryer in the system absorbs moisture and retains some refrigerant. When the refrigerant level drops below a certain point, the cooling capacity of the air conditioning system decreases. In some models with dual-zone air conditioning, insufficient cooling may result in warm air blowing from the vents. 2. Excessive contaminants in the compressor oil: This can clog the filter screen, reducing cooling efficiency, increasing resistance, and decreasing the flow of refrigerant to the expansion valve, resulting in poor cooling. Sometimes, if air enters the air conditioning system, it can cause high pressure in the refrigerant lines, leading to poor refrigerant circulation and insufficient cooling. 3. Problems with the dryer: The main function of the dryer is to absorb moisture from the refrigerant to prevent reduced cooling capacity due to excessive moisture. When the desiccant in the dryer becomes saturated, it can no longer filter out moisture. As the refrigerant passes through the expansion valve's orifice, the drop in pressure and temperature can cause the moisture in the refrigerant to freeze, obstructing the flow of refrigerant, increasing resistance, or even completely blocking it.

[WestonLee]

My Baojun 730 also had weak AC cooling issues last summer, and after several attempts, I finally figured it out. First, check if the cabin air filter is clogged—it's located behind the glove box. Take it out and tap it to see if there's too much dust. Next, inspect whether the condenser fins are blocked by willow catkins; just rinse them gently with a water spray. If these two are fine, it's likely due to insufficient refrigerant—hook up a pressure gauge to check the high and low pressure readings. I've also encountered a slipping compressor electromagnetic clutch—if you don't hear the 'click' engagement sound when turning on the AC, that's the culprit. Lastly, a reminder: never skip steps and directly top up refrigerant—if there's a pipeline leak, it'll only make things worse.

[LaLayla]

The mechanic at the repair shop told me that if the cold air isn't cooling properly, it's usually due to one of three issues. For the refrigeration system, you need to check the refrigerant pressure—both excessively hot high-pressure pipes and frosted low-pressure pipes indicate problems. On the electrical side, focus on the relay and compressor fuse; last time, my car's compressor wouldn't start because of a blown fuse. Mechanical failures most commonly involve seized compressor bearings, where the pulley spins freely but can't drive the piston. A less common issue is a clogged expansion valve, which can cause refrigerant to freeze and block the pipes. With newer cars, there's also the possibility of an air conditioning control module malfunction, which requires connecting to a computer to read the fault codes for confirmation.

[McMaddox]

As a seasoned driver with five years of experience with Baojun, I recommend starting with a basic check. After starting the engine, press the AC switch and observe whether the compressor pulley rotates. Feel the air conditioning pipes—the high-pressure pipe should be warm and the low-pressure pipe cold for normal operation. Test the cooling effect in recirculation mode; if the airflow is weak, the blower resistor might be faulty. Check the condenser cooling fan in front of the radiator—it should run at high speed when idling. Finally, test the temperature sensor by wrapping the probe with a hot towel to see if the AC automatically increases cooling intensity. If you still can't figure it out, spend fifty yuan at a repair shop for a full inspection.

[MacMarley]

I've studied this issue for a long time, and the core problem lies in the obstruction of the refrigeration cycle. The refrigerant goes through four processes in the system: it gets pressurized by the compressor and turns into a gas-liquid mixture, then dissipates heat in the condenser to become liquid, gets decompressed by the expansion valve to turn into low-temperature mist, and finally absorbs heat in the evaporator to become gas. As long as any of these steps fails, the cooling function stops. The most common issue is refrigerant leakage in the pipelines, especially at the compressor seals and condenser connections. New car owners often overlook clogged air conditioning drain pipes, which can cause the evaporator to freeze and lock up the entire system. Another counterintuitive point is the incomplete closure of the heater water valve, allowing engine hot water to mix into the air conditioning pipelines and disrupt the system.