Overcharging an AC system, meaning adding too much refrigerant, can lead to compressor failure. The excess refrigerant creates high pressure, potentially damaging the compressor’s internal components and leading to motor burnout. Additionally, the liquid refrigerant can enter the compressor’s cylinders, causing slugging and further damage. 

Here’s a detailed breakdown of what causes overcharging:

• High Pressure:

Overcharging raises the pressure in the system, particularly the head pressure, which the compressor is designed to handle at specific levels. Excessive pressure can physically damage the compressor and cause the motor to overheat. 

• Compressor Damage:

The compressor is designed to handle refrigerant as a gas. When overcharged, liquid refrigerant can flood the compressor’s cylinders, leading to “slugging”. This can damage pistons, connecting rods, and other internal components. 

• Oil Contamination:

The excess liquid refrigerant can also mix with the compressor oil, contaminating it and potentially causing lubrication problems. 

• Motor Burnout:

The increased workload and high pressure due to overcharging can cause the compressor motor to overheat and potentially burn out. 

• System Failure:

If the compressor is damaged due to overcharging, it may require replacement, potentially leading to a complete system failure.