What Causes the Abnormal Noise in Subaru Compressors?
3 Answers
Subaru compressor abnormal noise causes are as follows: Electromagnetic clutch contamination: Since the electromagnetic clutch is positioned relatively close to the ground, years of vehicle operation can cause it to accumulate sewage or mud, leading to internal bearing damage and resulting in abnormal noise. Drive belt looseness: The car air conditioning compressor has high operational requirements for the electromagnetic clutch. A loose drive belt increases the load on the electromagnetic clutch, making it prone to damage, and in severe cases, may cause compressor burnout. Repeated engagement of electromagnetic clutch: Frequent engagement of the electromagnetic clutch leads to insufficient generator output, causing inadequate working voltage for the compressor and resulting in abnormal noise. Lack of lubricating oil: Insufficient lubricating oil inside the compressor. After prolonged use, appropriate lubricating oil should be added to avoid abnormal noise or scrapping due to friction.
I've been in the auto repair industry for many years, and there are usually several main reasons for Subaru compressor noise. Bearing wear is the most common, sounding like squeaking or friction noises due to long-term operation and aging inside the compressor. Drive belt issues also frequently occur; a loose or worn belt can slip and produce a hissing sound, especially noticeable during acceleration. Damage to internal compressor components, such as piston or valve failure, can create a knocking or rattling noise. Insufficient lubrication or irregular oil changes can exacerbate friction noises. It's recommended that owners turn off the air conditioning immediately upon noticing unusual sounds for testing—if the noise stops, it likely points to a compressor issue. Check if the belt is loose or cracked, and visit a professional shop for diagnosis if necessary. Bearing replacement is relatively inexpensive, but delaying repairs could lead to complete compressor failure, affecting air conditioning performance. Regular maintenance every six to nine months, including cleaning and lubricating components, can significantly reduce risks.
As a car enthusiast who often tinkers with my Subaru, I've done quite a bit of research on compressor noise issues. Worn bearings will cause squeaking sounds, especially noticeable when starting the air conditioning. If the belt is loose or aged, it can produce noise similar to pulley friction. Insufficient oil in the compressor increases friction noise, while internal component damage like pistons can lead to irregular knocking sounds. I've tried checking belt tension in my garage - normal elasticity should be about three millimeters - and locating the compressor by sound. Be cautious about installation errors with new parts causing noise, a common oversight. Timely repairs prevent small issues from escalating; for example, replacing bearings might only cost a couple hundred yuan. Regular lubrication checks and belt maintenance pay off, saving unnecessary repair shop expenses. A tip I learned from online forums: don't ignore minor noises as they may signal the compressor's end of life.
