Troubleshoot an AC Not Blowing Cold Air

Troubleshoot an AC

Troubleshoot an ACThere are worse things that can happen than coming home to a warm and stuffy home, but after a long day at work, you just want to come home and put your feet up, feeling that cooling air breeze over you.

When it’s not there, you can’t really think of much else and it seems like a disaster zone.

Before panic dialling your favored emergency air conditioning specialist, take a moment and relax – an AC not blowing cold air may not necessarily mean that your checking account is going to feel the heat as well, it could be something quite simple and an easy fix.

There are a few simple and easy steps to try that may just help!

Check the Power

  • If there has been a power outage during the day, it is entirely possible that the timer on the system has been reset or lost the correct time. Equally, most systems have circuit breakers on them, it is always worth casting an eye over them as well.


  • Again, a power outage could have affected the thermostat, it should be checked to ensure that it is set at the correct temperature and that it is demanding cold air from the system. We have even known ‘little fingers’ (children!) to alter thermostats, causing them to keep the system off.

Change the Filter

  • When is the last time you changed the filter on your central air conditioning unit? If the filter is dirty, air cannot pass through it, causing the necessary coils to actually freeze. Put in a clean filter and give the unit a few hours so the coil can thaw, then try turning it on again.

Clean the Condenser

  • In many cases, an AC not blowing cold air indicates that the condenser is dirty. The condenser part of an HVAC system is the physical structure sitting outside your home. Try cleaning it by following these simple steps:
  1. Shut off power and disconnecting it according to the manufacturer’s instructions
  2. Remove the grills, taking care not to disturb any wiring
  3. Clean the fins and coils using a soft brush and vacuuming away any other debris

Once you have cleaned the condenser, try switching on the unit again to see if cold air starts blowing.

Still no Comfort?

  • There are many reasons why your air conditioning unit may not be working, unfortunately most of those other reasons will generally require a professional air conditioning technician.

The Good News Is …

A skilled professional will generally be able to fix most problems with ease; knowledge and expertize is everything when it comes to troubleshooting problems.

Here at McQuerry’s 24-Hour Heating and Air, we only employ the best technicians and their knowledge is unrivalled.

If you need to call an emergency technician out to fix your air conditioning unit or would like to schedule some maintenance to help prevent a breakdown, call us at 636-225-0087.