What are the reasons why a car air conditioner cannot cool?

[DelEmery]

The reasons why a car air conditioner cannot cool are as follows: 1. Insufficient or too little refrigerant: When the air conditioner is operating normally, if continuous slow bubbles are observed in the sight glass above the dryer, it indicates insufficient refrigerant. If obvious bubble flipping occurs, it means the refrigerant is severely insufficient. 2. Too much refrigerant: Excessive refrigerant can also cause the air conditioner to fail to cool. This is because the proportion of refrigerant in the air conditioning system has specific requirements. If the proportion is too high, it will affect heat dissipation. Similarly, adding too much cooling oil during maintenance will also reduce the heat dissipation of the refrigeration system. 3. Loose drive belt of the car air conditioner compressor: Car cooling relies on refrigerant, and refrigerant transmission depends on the air conditioner compressor. The drive belt is an important moving part that drives the compressor. If the belt is loose, the compressor will slip during operation, leading to reduced transmission efficiency, decreased compressor speed, and reduced refrigerant delivery, resulting in the car air conditioner not cooling. 4. Unqualified refrigerant and cooling oil: Excessive impurities in the refrigerant and cooling oil can also clog the car air conditioner's filter, causing the air conditioner to fail to cool. Increased resistance will reduce the refrigerant flowing to the expansion valve, leading to insufficient cooling capacity. 5. Moisture infiltration in the refrigeration system: If moisture enters the car air conditioner's refrigeration system, it can cause insufficient cooling or no cooling. If this is the case, the desiccant or dryer in the car air conditioner should be replaced. At the same time, the system should be vacuumed again, and a new appropriate amount of refrigerant should be injected.

[LaBrianna]

I've been driving for over 20 years, and the most common reasons for air conditioning not cooling are refrigerant leaks or insufficient refrigerant. It's like the air conditioning's blood has leaked out, so naturally it can't cool the air. Additionally, a broken compressor can cause the system to fail, and if the fan is clogged with dust, the cooling efficiency drops, rendering the air conditioning ineffective. On the electrical side, aging wires or blown fuses can interrupt signal transmission. During routine checks, first listen for any unusual sounds from the fan and feel if the air conditioning pipes are cold. If none of these work, it's advisable to visit a repair shop to check for leaks and the compressor's condition. After all, driving without air conditioning in summer is pure torture, and it can also prevent more significant malfunctions.

[DeBella]

I often work on my car myself. Last time the AC wasn't cooling, and I found the condenser was completely clogged with willow catkins. After cleaning it, it immediately returned to normal. This reminded me to regularly clean the engine compartment. Refrigerant leaks are also common, which can be caused by loose pipe connections or aging O-rings. You can try using a leak detector yourself. Compressor issues are troublesome and require professional diagnosis, otherwise the replacement cost can be high. Fan problems are usually easier to solve—just check if the blades are spinning properly. Don't overlook electrical faults, such as damaged switches or failed relays, which can prevent the compressor from starting. For safety, if you find any issues, consult a professional technician.

[Paislee]

As a new car owner, I recently experienced my air conditioning suddenly not cooling. In a panic, I searched online and learned it might be due to insufficient refrigerant or a leak. My neighbor mentioned that compressor failure is common and expensive to repair. Poor electrical connections are another potential cause; loose or corroded plugs can interrupt power supply. Additionally, a dirty filter can hinder heat dissipation, so it's recommended to clean it every season. I've picked up some simple DIY checks: after turning on the AC, listen for unusual noises in the engine bay and feel the pipes to ensure even temperature. If that doesn't help, it's best to visit a repair shop to avoid discomfort in hot weather and ensure driving safety.