Car AC Making Noise

Rattling, clicking, or grinding when the AC is on. Noises usually come from the compressor, clutch, or debris in the blower, and shouldn't be ignored.

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Common causes

Failing AC compressor or clutch
Worn or loose drive belt
Debris (leaves) in the blower fan
Loose mounting or bracket
Low refrigerant causing compressor strain

Frequently asked questions

Is a noisy AC dangerous?

Not immediately, but a grinding or rattling compressor can fail and contaminate the system, turning a small fix into an expensive one.

Why does it only make noise when AC is on?

The noise appears when the compressor engages — that's why it's tied to switching the AC on.

How it works

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