What to Check if Your Air Conditioner Isn't Cooling Video


If your central air conditioner isn't cooling like it should be, there are a few things you can check before calling for service. In this video from Sears PartsDirect, learn why the float switch may have shut down your air-conditioning unit and how you can fix it by removing clogs in the drain pipe. Also, learn how simple monthly maintenance can prevent clogs in the future.

If you're looking for other DIY help for your appliances or lawn and garden equipment, check out our repair help section for symptoms and troubleshooting advice, error codes, repair guides and replacement parts.

Air Conditioner Not Cooling: Float Switches and Drain Pipe Clogs

Check for Clogged Drain

Hi, this is Wayne with Sears Parts Direct. Is your central air conditioner not keeping things as cool as it should be? Here’s something to check before you make that call for service. Many central air conditioners have a drain float switch that shuts the system down if the drain is clogged and water backs up under the evaporator. If this switch trips, the air conditioner will shut down to avoid water damage.

If this well under the switch is full, then it's time to unclog the drain line. You may be able to remove the clog with a shop vac. If not, you can use a plumber's snake to clear the drain line.

Bleach Prevents Drain Clogs

To keep this thing from clogging up in the future, pour a cup of liquid bleach down the drain vent tube every month. The bleach kills mold and mildew that can build up inside the drain pipe and hose. To keep from killing the grass in your yard, stick a pan under the drain hose outside to catch the bleach as it runs out. And always remember to protect your eyes and skin when handling bleach and other harsh chemicals. You can get in the habit of doing this at the same time you change your air filter. You remember to do that every month, right?

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