How to Determine the Quality of a Car Air Conditioning Compressor?
2 Answers
Car air conditioning compressor quality refers to the efficiency of the compressor during operation. Under normal circumstances, after connecting the three-way pressure gauge set and starting the engine, if the low-pressure gauge needle drops rapidly and the high-pressure gauge needle rises quickly, and the amplitude of needle movement increases when the throttle is increased, it indicates good performance. The following is relevant information about air conditioning compressors: 1. Types: Compressors are divided into fixed displacement and variable displacement types. According to different working principles, air conditioning compressors can be categorized into fixed displacement compressors and variable displacement compressors. 2. Compressor noise level: The noise generated during air conditioning operation mainly comes from the internal evaporator and external condenser. National standards stipulate that for air conditioners with a cooling capacity below 2000W, the indoor unit noise should not exceed 45 decibels, and the outdoor unit should not exceed 55 decibels; for split air conditioners with a cooling capacity between 2500W and 4500W, the indoor unit noise should not exceed 48 decibels, and the outdoor unit should not exceed 58 decibels.
Here's a little trick I've learned to judge the condition of a car's AC compressor. Having driven for over a decade, whenever my AC acts up in summer, I first listen for sounds: after ignition with AC turned on, a properly functioning compressor should produce a slight humming noise, but if there's sharp screeching or intermittent knocking sounds, it likely indicates internal wear. Then I feel the air vent's coolness with my hand; if it blows warm air or no cold air at all, the compressor might not be running or the clutch isn't engaging. I also make it a habit to crouch and check under the engine compartment for any oil stains or green refrigerant leaks – if present, the compressor seals may have failed. Additionally, inspect the belt tension; a loose belt can prevent the compressor from turning. These simple checks take less than five minutes to roughly assess its condition. For definitive diagnosis, I'd recommend visiting a professional shop for pressure gauge testing to prevent potential issues.
