Loud Noises in Cheney, WA

AC noises aren't random. Each sound pattern points to a specific class of failure. Here's what's actually happening inside the system when you hear these sounds.

Banging or Clanking

This usually means something is loose or broken inside the unit - often a connecting rod, piston pin, or crankshaft inside the compressor, or a fan blade that has come loose and is striking the housing.

A banging compressor is serious. If you hear this, shut the system off and call. Running a compressor with internal damage accelerates the failure and can make the repair uneconomical.

Rattling

Rattling at startup or during operation typically points to loose panels, screws, or debris (leaves, sticks, small stones) inside the outdoor condenser unit. It can also indicate a failing motor mount - the rubber isolators that dampen vibration wear out over time and allow the motor to shake against the housing.

Cheney has seen significant residential growth over the past 15–20 years. Many of those homes were built with builder-grade AC equipment that is now hitting the end of its expected service life. Worn motor mounts and vibrating cabinets are common findings on units in that age range.

Squealing or Screeching

A high-pitched squeal usually means one of two things: a worn blower belt (on older belt-drive systems) or a failing motor bearing. Bearings are the small metal rings inside the motor that allow the shaft to spin smoothly. When they dry out or wear, they produce a metal-on-metal screech that gets progressively worse.

Don't run a squealing motor. A seized motor is a more expensive repair than a bearing replacement or motor swap caught early.

Grinding

Grinding is a step beyond squealing - it means the bearing has already failed and the motor shaft is running metal-on-metal. This is urgent. Continued operation will destroy the motor and can generate enough heat to cause additional damage to surrounding components.

Hissing or Bubbling

A steady hiss near the refrigerant lines or the indoor air handler points to a refrigerant leak. Refrigerant moves through your system under pressure; a leak in the line set or at a fitting creates a hissing sound as it escapes.

A bubbling or gurgling sound from the same area often means refrigerant is mixing with air or moisture - which indicates the system has been low on charge for a while.

Low refrigerant doesn't just reduce cooling - it causes the compressor to run hot and work harder than it was designed to. Left unchecked, it shortens compressor life significantly.

Before you call, here are a few safe checks you can do yourself. These won't fix the problem, but they help narrow things down and rule out the obvious.

• Turn the system off at the thermostat. If you hear a grinding or banging noise, don't keep running it. Continued operation can turn a repairable problem into a replacement.
• Walk to the outdoor condenser unit. Look through the grille for visible debris - leaves, sticks, or anything that could be contacting the fan blade.
• Check your air filter. A severely clogged filter restricts airflow and forces the blower motor to work harder, which can produce unusual sounds and accelerate wear.
• Listen for where the sound originates. Is it at the indoor air handler (in the utility closet or attic), at the outdoor condenser, or at the registers? This information helps us diagnose faster when we arrive.