Why Your AC Is Running But Not Cooling and What to Do About It
The hot weather is here – finally! It’s the middle of summer in Northern Michigan, and your air conditioner may be working overtime now to cool your home. But is your home actually cool and comfortable? You may hear the fan humming and know the unit is definitely on, but your home still feels hot and sticky. So your AC is running but not cooling. What is the problem, and how do you fix it?
Your AC Is Running But Not Cooling
If this is your situation, you’re not alone. It’s one of the most common summer issues we see at Weinkauf Plumbing & Heating. The good news? Some AC problems are simple fixes. Others may require a professional. Here’s how to troubleshoot the problem and get your cool air back.
1. Check Your Thermostat Settings
Let’s start with the basics. Check that your thermostat is set to “cool” and not just “fan.” The fan setting can make it feel like the system is running, but it won’t actually cool the air, it just circulates it. Also, make sure your desired temperature is set several degrees lower than the current room temperature. If it’s set at or above the current room temperature, the AC unit will not turn on.
2. Is Your Air Filter Dirty?
A clogged or dirty air filter can restrict airflow, making it harder for your system to push cold air through your home. This can also lead to frozen coils.
What to do:
Take out the air filter and hold it up to the light. If you can’t see through it, it’s time to replace it. We recommend changing your air filter every 1–3 months especially during peak cooling season.
3. Check for a Frozen Evaporator Coil
If you’ve noticed ice on your indoor unit or water pooling near your furnace, your evaporator coil may be frozen. This happens when airflow is restricted or refrigerant is low.
Signs of a frozen coil:
- Warm air coming from vents
- Ice or frost on the indoor unit
- Water leaks around the unit
What to do:
- Turn off your AC and let it thaw completely
- Replace a dirty filter
- Call us at Weinkauf if the problem returns
4. Your Outdoor Unit Might Be Blocked
The condenser coil in your outdoor unit releases the heat your AC removes from your home. If the unit is blocked by dirt, leaves, or weeds, it can’t do its job, and your home won’t cool down properly.
What to do:
- Turn off the power to the unit
- Gently rinse the unit with a garden hose
- Clear away any grass, leaves, or debris
If it’s still not cooling after that, there may be deeper issues inside the unit.
5. You Could Have a Refrigerant Leak
Low refrigerant levels can prevent your system from cooling at all. It may still run, but it won’t be able to absorb heat and cool the air. This is not something you can fix yourself.
What are the signs of a refrigerant problem?
- Your AC blows warm or lukewarm air
- It emits hissing or bubbling noises
- There is ice on the refrigerant line
What to do:
Call us at Weinkauf. We will send a licensed HVAC professional to inspect, repair, and recharge your system. You should never attempt to refill refrigerant yourself.
6. The Compressor Might Be Failing
If your AC is running but not cooling, and you’ve ruled out the easier fixes, the problem could be with your compressor. This component is responsible for pressurizing refrigerant and keeping the entire system running efficiently.
Compressor problems often require professional repair or replacement. If your unit is older than 10 years, it might be more cost-effective to upgrade the entire system.
When to Call a Professional
If you’ve tried the simple fixes above and still your AC is running but not cooling, don’t wait to call. Hot and humid air can take a toll on your comfort and your system.
Weinkauf Plumbing & Heating is your trusted local team for air conditioning repair, maintenance, and installation. Serving Alpena, Oscoda, and surrounding areas, we’re available when you need us. We’ve helped hundreds of homeowners in Northern Michigan get their air conditioning back on track quickly and affordably. Whether it’s a refrigerant issue, a faulty compressor, or just a tune-up, we’ll diagnose your problem and get it working again right away.
FAQs About Air Conditioning Repair
Why is my AC running but not blowing cold air?
Common reasons include a dirty air filter, low refrigerant, frozen evaporator coils, or a blocked condenser. If basic troubleshooting doesn’t help, call a professional for an inspection.
How much does AC repair cost in Northern Michigan?
Costs vary depending on the issue, but minor repairs usually range from $150–$500. Compressor or refrigerant issues may cost more.
How quickly can Weinkauf Plumbing & Heating come out?
We offer prompt scheduling and emergency service calls throughout Alpena and Oscoda. Call us to check our availability today.
Is it worth repairing an old air conditioner?
If your unit is over 10 years old and requires frequent repairs, it may be more cost-effective to upgrade to a newer, more energy-efficient system.
