What Causes the Abnormal Noise in BMW 5 Series Compressor?
2 Answers
BMW 5 Series compressor abnormal noise reasons are as follows: Engine overheating: Check the cooling system. Exhaust system blockage, in the exhaust system, check if the exhaust pipe is cracked. Vacuum tube leakage or breakage. Generator bearing damage: The generator bearing may be damaged. Engine speed: The relationship between abnormal noise and engine speed - the presence of most common abnormal noises in the engine depends on the engine's speed state. Relationship between abnormal noise and temperature: Noise occurs at low temperatures and reduces or even disappears when temperature rises; noise occurs when temperature rises and reduces or disappears when temperature drops.
I've driven a BMW 5 Series for many years. Compressor noise usually comes from internal parts wearing out or getting old, like bearing damage causing friction sounds. Also, a loose or worn belt can make noise; not enough or too much refrigerant can also put extra strain on the compressor, causing noise. Ignoring it makes the problem worse—the whole compressor might fail, leading to expensive repairs. First, check the belt tension; if that doesn't help, go straight to the dealership for professional diagnosis. Regular maintenance of the AC system can prevent issues—don't wait for small problems to become big ones. Safety-wise, noise affects AC performance—no cool air in summer makes driving uncomfortable and may cause other failures. Fixing it promptly is the right move.
