What Causes Noise in a Car Compressor?
2 Answers
Car compressor noise can be caused by: failure of the compressor electromagnetic clutch, severe internal wear of the compressor, clutch slippage during engagement, excessively high system pressure, wear of the clutch bearing, excessive clearance or lack of lubrication in the clutch bearing, or slippage due to loose or worn compressor drive belts. The car compressor is the heart of the automotive air conditioning refrigeration system, responsible for compressing and delivering refrigerant vapor. Depending on the working principle, air conditioning compressors can be categorized into fixed-displacement compressors and variable-displacement compressors. Based on the working method, they are generally divided into reciprocating and rotary types. Common reciprocating compressors include crankshaft-connecting rod and axial piston types, while typical rotary compressors include rotary vane and scroll types.
My experience in car repairs tells me that noise from the car compressor usually indicates mechanical issues. Worn bearings or damaged internal pistons in the compressor itself can cause squeaking or grinding sounds, which get louder over time. If the belt is old and loose, it may slip and squeal during operation, and failing to replace it promptly can overload the compressor. Refrigerant leaks or insufficient levels can cause unstable system pressure, making the compressor work harder and produce a humming noise. Insufficient lubrication is another cause, as low oil levels increase friction. Ignoring these issues not only leads to annoying noise but could also damage the entire AC system. It's best to take the car to a repair shop for a thorough inspection. If the compressor itself is faulty, timely repairs or part replacements should be done to avoid higher costs later.
