Poteet HVAC Repair: AC Runs but Won’t Cool — Fixes

Estimated Read Time: 9 minutes

AC running but not cooling? You are not alone, especially in the Texas heat. If your system is blowing warm air or struggling to keep up, this guide shows the most common reasons and what you can safely try before calling a pro. You will also learn when to act fast to avoid bigger repairs and how to lock in savings with tune-ups and membership perks.

Why Your AC Runs But Does Not Cool

When the blower runs but the air is not cool, the system is often starved of airflow or refrigerant, or the thermostat is not sending the right signal. Start with simple checks, because some fixes take five minutes and cost nothing. If your system is icing up, short cycling, or tripping a safety switch, address it promptly to prevent compressor damage.

Common symptoms that point to easy-to-spot causes:

1. Warm air or weak airflow often means a clogged filter or iced coil.
2. Frequent on and off cycling can signal a dirty condenser or low refrigerant.
3. Odd smells may indicate microbial growth on the coil or a drain issue.
4. Rising energy bills usually point to airflow problems or duct leaks.

Texas tip: Attics in San Antonio, New Braunfels, and Boerne can hit 130+ degrees in summer. Any airflow restriction in that environment quickly snowballs into no-cool calls.

Step 1: Check the Thermostat and Settings

Thermostats get bumped or switched to the wrong mode. A two-minute check can save a service call.

Do this:

1. Confirm the thermostat is set to Cool and Fan is on Auto.
2. Lower the setpoint at least 3 degrees below room temperature.
3. Replace the thermostat batteries if it is battery powered.
4. Make sure schedules or eco modes are not overriding your setting.

If your outdoor unit is not running, check the breaker labeled AC or Condenser. If tripped, reset once. If it trips again, call a pro.

Step 2: Replace or Clean the Air Filter

A clogged filter suffocates your system and can freeze the evaporator coil.

What to do:

1. Turn the system Off at the thermostat.
2. Replace the filter if it looks gray or dusty. In Texas, consider changing every 30 to 60 days, especially during cedar or oak pollen spikes.
3. Wait 30 minutes with the system Off if you suspect icing, then turn Cool back On.

Benefits of a clean filter:

• Restores airflow and cooling output.
• Reduces energy use and strain on the compressor.
• Helps maintain indoor air quality during allergy seasons.

Step 3: Inspect the Outdoor Unit (Condenser)

Your condenser needs airflow to shed heat. Grass clippings, cottonwood, or fencing too close to the unit act like a blanket.

Quick inspection:

1. Clear leaves and debris from the top and sides.
2. Maintain 2 feet of clearance on all sides.
3. Gently rinse coils from the inside out using a garden hose. Do not bend the fins.

If the fan outside runs but air inside is warm, dirty coils or a failed capacitor could be the issue. Capacitors store energy to start motors and are a frequent Texas failure due to heat. This is not a DIY repair.

Step 4: Look for Ice or Water Issues

Iced refrigerant lines or a frosted indoor coil mean restricted airflow or low refrigerant. A tripped float switch from a clogged drain will also stop cooling to prevent water damage.

Do this:

1. Turn the thermostat to Off and set Fan to On for 60 minutes to melt ice gently.
2. Check the condensate drain at the indoor unit. If you see standing water in the pan, the drain may be clogged.
3. If icing returns, you likely need professional diagnostics for refrigerant charge and coil condition.

Important: Never chip ice. You can damage the coil and cause a refrigerant leak.

Step 5: Check Vents and Rooms with Hot Spots

Closed supply vents or blocked returns can choke airflow. In Texas homes with long duct runs to second floors, small restrictions add up fast.

What to check:

• Open supply vents at least 80 percent and keep returns unblocked.
• Feel for strong airflow in multiple rooms. Weak or noisy vents can indicate duct leaks.
• Rooms over a garage or facing west may need balancing or insulation upgrades.

If one or two rooms never cool, you may benefit from duct sealing, damper adjustments, or a zoning evaluation.

Common Causes That Require a Professional

Some problems look simple from the thermostat but need licensed tools, parts, and know-how. Here are the top culprits we see on real service calls across San Antonio, DFW, and Houston.

Low Refrigerant or a Leak

Symptoms:

• AC runs constantly, air is cool but not cold.
• Ice on the refrigerant line or evaporator coil.
• Hissing at the indoor or outdoor unit.

Why it matters:

• Low charge overheats the compressor and spikes bills.
• A leak must be located and fixed before adding refrigerant.

Pro solution:

• Pressure test, leak search, and repair. Recharge to manufacturer specs. We document readings so you know the system is right.

Failing Capacitor, Contactor, or Fan Motor

Symptoms:

• Outdoor unit hums but fan does not spin.
• System starts and stops quickly or will not start.

Pro solution:

• Test and replace electrical components with matched parts. Heat and voltage fluctuations in Texas make these common mid-summer failures.

Dirty or Damaged Evaporator/Condenser Coils

Symptoms:

• Poor cooling even after filter changes and hose rinse.
• High head pressure readings in diagnostics.

Pro solution:

• Professional coil cleaning with industry-safe cleaners and fin straightening. If the coil is corroded, we recommend repair options or replacement with upfront pricing.

Clogged Condensate Drain or Safety Switch Lockout

Symptoms:

• Indoor unit runs but no cooling, or unit will not run at all.
• Water in the drain pan, musty smell, or ceiling stains near the air handler.

Pro solution:

• Clear the drain, sanitize, and test float switches. We verify safe drainage to prevent future overflows.

Duct Leaks and Poor Static Pressure

Symptoms:

• Some rooms are hot, others ice cold.
• Dust issues and higher energy bills.

Pro solution:

• Duct inspection and sealing. We test static pressure and can provide AeroSeal options that come with an official Certificate of Completion and often cut leakage by 90 percent or more.

When Repair Is Not the Best Answer

If your AC is 12 to 15 years old, repairs can stack up fast. In that case, compare the cost of a big repair to a new, properly sized system.

Good reasons to consider replacement:

1. Repeated refrigerant leaks or a failed compressor.
2. Repair cost exceeds 30 to 40 percent of a new system.
3. Poor comfort in multiple rooms even after duct fixes.

What you get with Elmer’s on new systems:

• Same-day start and an upfront price.
• Duct cleaning, static air test, and complete system customization included with all new systems.
• Financing and flexible payment plans to fit your budget.

Prevent the “Running But Not Cooling” Problem

Routine maintenance is the most reliable defense against surprise breakdowns in July.

What a pro tune-up includes:

1. Multi-point inspection of electrical components, refrigerant levels, and airflow.
2. Clean condenser and check coil condition.
3. Test safety devices and clear the drain.
4. Measure static pressure and temperature split so you know your system’s baseline.

Elmer’s Home Comfort Club makes it easy:

• HVAC maintenance 2x a year, electrical inspection, and ductwork inspection.
• Clean condenser, 10% off of service repairs, and guaranteed service within 24 hours.
• Front-of-the-line booking, reduced after-hours rate, and no service fee for members.
• Plans from $11.95 per month or $143.40 annually for the first unit.

Safety and DIY Guardrails

It is smart to try basic steps, but stop and call if you see any of the following:

• Burning smell, repeated breaker trips, or smoke.
• Icing that returns within 24 hours after a new filter and coil thaw.
• Water near your indoor unit or ceiling stains.
• The outdoor fan does not spin or the unit hums without starting.

A licensed technician protects the most expensive part of your system: the compressor. Proper measurements and manufacturer-specified charge settings matter for long life and low bills.

Why Texans Choose Elmer’s for Fast, Same-Day Cooling

• We stock thousands of parts and supplies to restore your comfort on the same day.
• 24/7 Emergency Services because Texas heat will not wait.
• Upfront pricing with no surprises, plus free estimates for replacements.
• Weekly technician training and a 100% Satisfaction Guarantee.
• Licensed and insured. HVAC TACLB124872. Electrical TDLR #40048. Plumbing RMP-45206.
• Proudly serving San Antonio, the Dallas–Fort Worth Metro, and Houston since 2004.

If you want relief today, we can usually be there fast, and most repairs finish the same day you call.

Special Offers to Fix No-Cool Fast

• Save $50 on HVAC Repairs. Use code: $50 OFF HVAC & Plumbing Repairs. Expires 2026-08-05.
• Free HVAC Service Call for First-Time Customers (Up To $159 Value). Expires 2026-08-05.
• Free Second Opinion on Any HVAC Repair. Expires 2026-08-05.
• $129 Elmerization Tune-Up to improve cooling performance.

Special Offer: Save $50 on AC repair today. Call (210) 489-1389 or schedule at https://elmershomeservices.com/ before 2026-08-05.

What Homeowners Are Saying

"We bought an as-is house and knew the AC was over 14 years old. So we called Elmer's and got a quote for a whole new system including new ducts. ... We felt really comfortable and anytime there was an issue they were there within the hour to fix it. ... They really did an amazing job and were very respectful of my property."
–Tanya A., HVAC Installation

"Tyler and Jameson were also very professional and got the major installation job done that same day in my hot house. ... They really came through for my family and new puppy and went above and beyond my expectations of an HVAC company to get the job done fast."
–Jeff A., AC Replacement

"We needed our AC system checked. Nathan Gilbert was our service technician. He did a fantastic job. He was very thorough even took pictures to show us his work. We will be using Elmers for all our AC/Heating needs."
–Marianne H., HVAC Maintenance

"Carlos Martinez did an exceptional job for us. He diagnosed the problem, explained the options for services, and fixed the recommended options. Thanks!"
–Sandy C., HVAC Repair

Frequently Asked Questions

Why does my AC run but not blow cold air?

Most often it is a clogged filter, dirty outdoor coil, or low refrigerant from a leak. Start with a new filter and clear debris around the condenser. If cooling does not return, call for diagnostics.

Is it safe to run the AC if the lines are iced?

No. Turn the system Off and set Fan to On to thaw the ice. Running while iced can damage the compressor. If ice returns within a day, you likely need professional service.

How often should I change my AC filter in Texas?

Every 30 to 60 days in peak season, more often if you have pets or during heavy pollen. A clean filter keeps coils from icing and restores cooling performance.

What temperature should come from my vents?

A healthy system typically shows a 16 to 22 degree Fahrenheit drop between return and supply air. Large deviations can indicate airflow or refrigerant issues.

When should I replace instead of repair?

If the system is 12 to 15 years old, has repeated leaks, or a repair costs 30 to 40 percent of a new system, replacement may be smarter. Ask for an upfront quote and financing options.

Conclusion

When your AC is running but not cooling, a few simple checks can restore comfort fast. If airflow, icing, or electrical issues persist, schedule expert help. For fast, same-day AC repair near San Antonio and surrounding cities like New Braunfels, Schertz, and Boerne, we are ready 24/7.

Call or Schedule Now

• Call: (210) 489-1389
• Book online: https://elmershomeservices.com/
• Coupon: Save $50 on HVAC Repairs through 2026-08-05 or claim a Free HVAC Service Call for first-time customers.

Stay cool, save money, and get it fixed right the first time with Elmer’s Home Services.

Call (210) 489-1389 or schedule at https://elmershomeservices.com/ to restore cold air today. Ask for our $50 OFF HVAC Repairs or Free First-Time Service Call offer. We proudly serve San Antonio, New Braunfels, Schertz, Cibolo, Boerne, and more across Texas.

About Elmer's Home Services

Since 2004, Elmer’s Home Services has helped Texas homeowners stay comfortable with certified HVAC pros, upfront pricing, and a 100% Satisfaction Guarantee. We proudly serve San Antonio, the Dallas–Fort Worth Metro, and Houston. Our Promise: We show up on time, do what we said we would, and do it right. We stock thousands of parts for same-day fixes and back our work with clear licenses: HVAC TACLB124872 and Electrical TDLR #40048.