Squealing Noise When AC Is On
A loud squeal or screech the moment you turn on the AC. This usually comes from the drive belt or a struggling compressor under load.
Find a TechnicianCommon causes
- Worn, glazed, or loose serpentine belt
- Failing belt tensioner or idler pulley
- Seizing AC compressor
- Compressor clutch problem
- Belt misalignment
Frequently asked questions
Why does the belt squeal only with AC on?
Switching on the AC adds load via the compressor; a worn or loose belt slips under that extra load and squeals.
Can I just replace the belt?
Sometimes, but if the compressor is seizing it can ruin a new belt quickly — a diagnosis confirms the real cause first.
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