Pull out your fridge from the wall, look at the back or underneath, and you’ll find a set of coils coated in dust, pet hair, and lint. Cleaning those coils is one of the few things a homeowner can do that genuinely extends the life of the appliance and keeps the electric bill down. Here’s how to do it, and what to watch for along the way.
Why the Coils Matter
Condenser coils release heat from the refrigerant as part of the cooling cycle. When they’re clean, heat dissipates easily and the compressor runs shorter cycles. When they’re caked in debris, the compressor has to work longer and harder to reach the same temperature. Over time that shortens compressor life. It also means the fridge interior runs a few degrees warmer than it should, which affects food safety and causes the unit to run almost constantly.
Cleaning the coils once a year is a reasonable maintenance interval for most households. If you have pets that shed, every six months is smarter — fur and hair clog coils faster than ordinary dust.
Where the Coils Are on Your Fridge
This varies by model. On older side-by-side and top-freezer refrigerators, the coils are usually on the back of the unit, exposed. You’ll see them as soon as you pull the fridge out.
On most refrigerators made in the last 15 to 20 years, the coils are underneath, behind a snap-off grille at the base of the front. A few French-door and counter-depth models place them at the back even on newer units. If you’re not sure, check the owner’s manual or search the model number online before you start.
What You Need
- A vacuum cleaner with a brush attachment (or a crevice tool)
- A refrigerator coil brush (long, flexible, sold at hardware stores)
- A flashlight
- Optional: a can of compressed air
No chemicals, no special cleaners.
How to Clean Them, Step by Step
1. Unplug the refrigerator. Always. The condenser fan near the coils is exposed on some models, and you don’t want it spinning while your hand is near it.
2. Pull the fridge away from the wall (or remove the front grille if the coils are underneath). Give yourself enough room to work comfortably.
3. Vacuum what you can reach. Use the brush attachment to pull debris off the coils and the floor around them. Don’t push the vacuum nozzle hard against the coils; the fins are thin aluminum and bend easily. Bent fins reduce airflow and are hard to fix after the fact.
4. Run the coil brush through the coils. The brush is narrow and flexible so it can get between rows of coils where the vacuum can’t reach. Work from side to side, then vacuum up what falls out.
5. Check the condenser fan. While you’re back there, look at the fan blade. Dust builds up on the blades and throws the fan out of balance, which causes the humming or rattling sound a lot of homeowners notice before they call. Wipe the blades with a dry cloth.
6. Plug the fridge back in and push it into place. Plan on 4 to 6 hours for the unit to settle back to its normal temperature. That’s typical after the fridge has been unplugged and moved; it’s not a sign of a problem.
The actual cleaning takes about 20 minutes. Most of that is moving the fridge.
Signs the Coils Were the Problem
If your fridge was running warm or cycling constantly, and it improves within a day of cleaning the coils, that was likely the main cause. The compressor needed a break and wasn’t getting one.
If the fridge is still running warm after cleaning, the problem is something else: a failing compressor, low refrigerant (almost always a leak, not a simple recharge situation), a bad evaporator fan motor, or a defrost system that’s stuck. Those are not DIY repairs.
What to Leave to a Tech
Cleaning coils is safe and straightforward. Everything behind the coils is not. Refrigerant is under pressure, requires EPA Section 608 certification to handle legally, and isn’t sold to the general public. Compressor replacements involve significant electrical work and sometimes mean the repair isn’t economically worth it compared to a replacement. Sealed system work (the compressor, condenser, evaporator, and refrigerant lines) is where a trained technician earns their keep.
A few signs that mean it’s time to call:
- The fridge is warm even after coil cleaning and you’ve confirmed the thermostat is set correctly
- You hear the compressor clicking on and off repeatedly without running (can point to a failed start relay or a compressor that’s overheating and shutting itself off)
- There’s ice buildup on the back wall of the refrigerator compartment (not the freezer), which usually points to a defrost system failure
- The unit is more than 15 years old and struggling; at that age, a diagnosis call makes sense before putting money into parts
None of those situations are emergencies in most cases, but they won’t resolve on their own.
A Note on Frequency
A lot of service calls I see could have been avoided with basic maintenance. Dirty coils don’t cause sudden failures, but they accelerate wear over years. A fridge that’s been running hard for three years on packed coils has more wear on the compressor than one that’s been cleaned annually. The difference shows up eventually.
Clean them once a year. Set a phone reminder if that helps. It’s one of the few maintenance tasks on a refrigerator that’s genuinely within reach for most homeowners.
If you’re past the point of DIY or want a tech to assess what’s actually going on with your unit, we cover the Tri-Valley and East Bay and typically get out same or next day. You can book or get in touch at adriumservice.com.