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Why does the compressor belt slip when the air conditioning is turned on?

2 Answers

Jodie

07/28/25 11:02pm

When the air conditioning compressor belt slips upon turning on the air conditioning, it is due to the belt being too loose. Below is an introduction to the air conditioning belt: Introduction to the air conditioning belt: The multi-ribbed belt, also known as the air conditioning belt, functions to drive the generator, air conditioning compressor, and power steering pump. It is mounted on the crankshaft pulley and tensioned by the air conditioning belt tensioner. When this belt is damaged, you may experience heavy steering assistance or a complete loss of power steering. If the air conditioning is turned on, the air conditioning compressor will not start, resulting in no cooling. Impact of belt tension on the air conditioning system: The tension of the compressor drive belt directly affects the performance of the car's air conditioning system. If the compressor belt is too loose, it can lead to poor cooling performance. It is important to adjust the compressor belt promptly. If the belt slips severely when starting the air conditioning, a "squeaking" noise may occur, indicating that the belt and tensioner should be replaced. The tension of the compressor drive belt also significantly impacts the lifespan of the electromagnetic clutch. If the belt is too loose, the electromagnetic clutch is prone to slipping; if it is too tight, the load on the electromagnetic clutch increases. Improper belt tension can cause the compressor to malfunction or even lead to compressor damage. Additionally, if the compressor pulley and generator pulley are not aligned on the same plane during operation, it can reduce the lifespan of the drive belt or the compressor itself.

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ORonan

08/12/25 3:27am

I've been driving for over a decade and encountered many belt issues. When the AC compressor belt slips as soon as the air conditioning is turned on, there are usually several reasons. The most fundamental one is insufficient belt tension—over time it loosens, and when the compressor starts with increased load, it slips. Another reason is severe aging and wear of the belt, with many surface cracks reducing friction. I remember one summer when the belt squealed and slipped after turning on the AC. Upon inspection, the belt was too old, and replacing it fixed the issue. Additionally, belt contamination by engine oil is quite common; oil leaks dripping onto the belt cause it to slip. You should regularly check the belt's condition, tightening it about every six months, and replace it if cracks are found. Otherwise, slipping can lead to cooling failure or even belt breakage, affecting the engine. Keeping the engine clean to avoid oil contamination can reduce such troubles, saving you hassle and preventing roadside breakdowns.

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