AC Making Noise — What It Means | HeatLand Metro Vancouver

AC making noise in Metro Vancouver — what different sounds mean, which are serious, and when to call HeatLand for diagnosis and repair.

What your AC’s sounds are telling you

Some AC sounds are normal. Others are early warning signs of problems that are cheaper to fix now than after they cause further damage. This guide covers the most common noises Metro Vancouver homeowners hear from their AC or heat pump and what each likely means.

Frequently asked questions about noisy AC systems

What does a clicking noise from my AC mean?

Clicking at startup and shutdown is normal — that’s the contactor engaging and disengaging. Repeated clicking during operation, especially if the system doesn’t start, usually indicates a failing contactor or capacitor. A single loud click followed by a hum and shutdown is often a hard-starting compressor or capacitor issue. Call HeatLand for a diagnostic.

What does a banging or clanking noise from the outdoor unit mean?

Banging or clanking usually indicates something is loose or broken inside the outdoor unit — a loose fan blade, a broken fan motor mount, or in some cases a component inside the compressor. Shut the system off and call HeatLand. Continued operation with a loose component can cause further damage.

Why is my mini-split or AC making a grinding noise?

Grinding typically indicates a bearing failure in a fan motor. The blower motor bearings in the indoor unit or the fan motor bearings in the outdoor unit wear over time. Grinding that gets progressively worse means the motor is near the end of its life — call HeatLand before the motor seizes completely.

My AC makes a hissing or bubbling sound — should I be concerned?

A hissing sound from the refrigerant lines or the indoor unit can indicate a refrigerant leak. A bubbling or gurgling sound often indicates air or moisture in the refrigerant circuit, also a sign of a leak. Both require a licensed HVAC technician — refrigerant is a controlled substance and its handling requires certification. Call HeatLand for a refrigerant leak check.

What does a high-pitched squealing from my AC mean?

High-pitched squealing from an AC outdoor unit is often a sign of high refrigerant pressure or, less commonly, a worn fan belt (on older belt-drive systems). Squealing from the indoor unit is often a worn blower wheel bearing. Either way, call HeatLand for diagnosis — these issues typically worsen over time.

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