Compressor overheating is one of the industry's most serious field problems today. Compressor overheating is usually caused by high compression ratios. High compression ratios can be caused by a combination of high condensing pressures (temperatures) and low suction (evaporating) pressures.
Causes of high condensing temperatures include dirty condenser coils, restricted condenser airflow (fan out), air in the system, an overcharge of refrigerant, and/or high ambient temperature.