A healthy dryer makes one sound: a steady tumble-and-hum you stop noticing. When it starts adding percussion, the new sound is a diagnosis you can phone in — literally; describe it when you call and we'll usually name the part before the van leaves. Here's the field guide we use, noise by noise.
The escalating squeal: idler pulley
A high squeal that starts seconds into the cycle and gets angrier over weeks is the idler pulley — the spring-loaded wheel that keeps belt tension. Its little bearing dries out, sings, then seizes; a seized idler then burns the belt, promoting a cheap repair to a medium one. This is the single most common dryer noise in our South Bay logs, and it's a stocked, same-visit part.
The rhythmic thump: rollers or a flat-spotted belt
A steady thump-thump-thump synced to drum rotation points at the drum support rollers wearing flat, or a belt that sat pinched under a hot drum and took a set (common after a machine sits loaded and idle — think a rental turnover or a long vacation). Rollers replace as a set, because one flat roller means its partners are next, and the belt gets inspected in the same opening.
The scrape or clank: something's in there
A metallic scrape or intermittent clank is usually a stowaway — a coin or bra wire riding the gap between drum and bulkhead, a screw in the blower wheel, or the drum's felt seal worn through so metal kisses metal. The felt seal version leaves its own evidence: scorch marks on clothes and brown dust at the drum edge. All findable in one teardown, all modest parts.
The low growl or rumble: motor bearings
A deepening growl that's loudest right at the machine's base, sometimes with a hot-electrical smell late in the cycle, is the drive motor announcing retirement plans. On most machines a motor still pencils against replacement; on an aging budget unit we'll give you the honest math before committing — and either way, keep an ear on it, because motors rarely improve with encouragement.
Why noise-stage repairs are the cheap ones
Every sound above is a part in its early, affordable act. Run it for months and the idler takes the belt with it, the rollers gouge the drum, the stowaway chews the seal. One visit, the cabinet opened, the noisy part named with your own ears as witness, and a written fixed price — that's the whole play, anywhere from San Jose to Milpitas.
