A clogged filter is the most common reason an AC stops blowing cold air, so swapping it is always the right first move. But what if you changed the filter and your AC still isn’t cooling? Here’s what to check next and when to call a pro.
First, Give It Time
After replacing the filter, wait at least a few hours, some systems need closer to 12, before judging it. If a frozen coil was the issue, the system may need time to thaw and recover before it blows cold again.
Make Sure You Used the Right Filter
The wrong size or a filter that’s too dense for your system can restrict airflow just like a dirty one. Match the size printed on your old filter and don’t over-restrict it.
If It’s Still Not Cooling, Look At These
- Low refrigerant or a leak, the most common deeper cause; the system runs but can’t cool
- A frozen or dirty evaporator coil blocking heat exchange
- A damaged or struggling condenser outside
- A failing compressor or capacitor
- The thermostat set or calibrated wrong
When to Stop DIY-ing
Cleaning the outdoor unit and confirming the thermostat is set to cool are fine to try yourself. Refrigerant, electrical, and compressor issues are not, they need the right tools and a license. If a fresh filter didn’t fix it, the problem is usually one of these.
Get a Real Diagnosis
If your AC still isn’t blowing cold after a new filter, Bearcat will find the actual cause and quote the fix up front. See our AC repair services, or call (509) 891-5110.
