You know that sinking feeling when you open the fridge and the milk feels a little less than cold, or the lettuce looks sad and wilted? Your refrigerator is humming along, the lights are on, and the compressor is buzzing like usual, but for some reason, the temperature inside just isn’t dropping. Before you panic and start pricing new models, take a deep breath. Many times, this is a problem you can actually fix yourself with a little patience and some basic troubleshooting. Let’s walk through the most common reasons why your fridge is running but not getting cold, and what you can do about it.

First, let’s think about what your refrigerator does. It works by pulling heat out of the inside and releasing it into your kitchen. If that heat can’t escape, the inside won’t cool down. So, one of the very first things to check is something called the condenser coils. These are usually located either behind the fridge or underneath it, behind a small kickplate. They look like a series of dark, snaking tubes with thin metal fins. Over time, these coils pick up dust, pet hair, and greasy kitchen grime. When they get coated in gunk, they can’t release heat properly. Your fridge has to work harder, and it may run constantly without ever getting cold. Simply unplug the refrigerator, pull it out from the wall, and give those coils a good vacuuming using a brush attachment. If they’re really dirty, you can use a coil cleaning brush. Doing this twice a year can prevent a whole host of problems.

Another sneaky culprit is the evaporator fan motor. Wait, don’t let the fancy name scare you. The evaporator fan is the small fan that circulates cold air from your freezer into the fridge section. If that fan stops spinning, the freezer might still get cold, but the fridge will stay warm. Open your freezer door and listen for a gentle hum or whoosh of air. If you hear nothing, but you can feel the compressor running (that’s the humming sound from the back or bottom), the fan might be blocked by ice or simply burned out. Check for frost or ice buildup blocking the fan blades. If you see a solid block of ice, you likely have a defrost system issue. But if the fan is free and still won’t spin, you may need to replace the motor. That’s a moderately easy DIY repair once you locate the part, but it does require careful work.

Speaking of ice, a common and often overlooked issue is a clogged or frosted-over evaporator coil. This is different from the condenser coils I mentioned earlier. The evaporator coil lives inside your freezer, usually behind the back panel. Its job is to absorb heat from the inside. If too much frost accumulates on it, air can’t pass through, and the fridge loses its cooling ability. Sometimes this happens because the defrost heater, timer, or thermostat has failed. If you notice heavy frost on the back wall of your freezer, or if your ice cream gets soft while stuff in the fridge stays warm, this could be the problem. Unplug the fridge, remove the back panel, and take a look. If you see a thick layer of ice, you can melt it with a hair dryer (never use an ice pick or sharp object). If the ice keeps coming back after a few weeks, then you’ve got a faulty defrost component that you can order and replace with a little online research.

Then there’s the start relay, which is a small plastic square attached to the side of the compressor. This little device gives the compressor a jolt of electricity to start it running. When it fails, the compressor may hum but not actually start, or it might try to start and then click off. You can test this with a multimeter, or simply replace the relay if it looks burnt or cracked. It’s a cheap part and a very common fix for a refrigerator that runs but doesn’t cool.

Before you go deep into repair parts, though, check the simple things. Is the temperature dial set correctly? Maybe someone bumped it. Are the vent holes between the freezer and fridge blocked by a bag of something? Are the door seals (gaskets) clean and tight? Warm air leaking in can make the fridge work non-stop without ever getting cold. A simple dollar bill test can check the seal. Close the door on a dollar bill. If you can pull it out easily, the gasket may be worn.

Obviously, if your fridge is more than ten years old and the repair costs are steep, it might be time to shop for a new one. But for many common problems, a little effort and a replacement part under fifty bucks can bring your trusty machine back to life. Start with the easy cleaning and airflow checks, then move on to fans and defrost issues. And always unplug the refrigerator before poking around inside. You’ve got this. With cautious hands and a bit of curiosity, you might just save yourself a service call and feel pretty proud in the process.