A loud grinding, squealing, or rattling noise when you turn on the AC can have two sources: noises from the engine compartment usually point to a failing AC compressor, worn compressor clutch; noises from inside the passenger compartment point to a problem with the blower motor or fan. The noises tend to get worse under load on warm days.
- Customer reported symptoms: “AC making noise,” “squealing when AC on,” “rattling behind dash,” “noisy blower fan.”
- Local influences: Temperature swings and rough winter roads around Ann Arbor can accelerate wear on AC pulleys, belts, and mounts.
- Risks: Ignoring noise can lead to sudden compressor failure and contamination of the entire AC system with metal debris.
- Diagnosis: A technician listens for the noise source, inspects compressor drive belts and pulleys, and tests compressor and blower operation under load.
Hoover Street Auto Repair’s ASE‑certified auto air conditioning technicians can quickly pinpoint AC noises and recommend safe, cost‑effective AC repairs before a minor sound becomes a major breakdown.