Mercedes-Benz AMG GT 55 AC Compressor Replacement Cost

In most cases, a vehicle with a bad air conditioning compressor is safe to drive. However, if grinding is heard from the compressor pulley, bearing failure may occur, causing the serpentine belt to come off. If this occurs, the battery warning light will illuminate, and the engine will stall due to lack of electrical power.

Failure of the air conditioning compressor is common because moisture or clogs in the system will place stress on the compressor. Compressor clutch failure is much more common on older vehicles. In general, AC compressors tend to fail after 60,000 to 70,000 miles, but that time may vary depending on use, demand and operating conditions.

Diagnosing the compressor requires advanced knowledge of air conditioning systems. AC systems should be repaired by a technician with proper training and certification. Professional-grade equipment is used to read the pressure, and the technician must rely on hours of classroom and training to diagnose the faulty part. 

"Stop leak" compounds are not recommended, as they are a temporary solution and can damage AC components, resulting in expensive repairs.

Replacement of most air conditioning components requires the complete evacuation of the air conditioning system. The serpentine belt, refrigerant lines and electrical connectors must be removed. Finally, the mounting bolts and hardware must be removed to let the compressor come free from the engine. A new compressor will then be installed, all parts will be put back in place, and the AC system will be recharged with refrigerant.