Cedar Creek AC Repair: Why Your Unit Runs but Won’t Cool

Estimated Read Time: 9 minutes

AC running but not cooling? You are not alone during an Austin heatwave. When the system hums yet the house stays warm, it usually points to a fixable issue. Below are the seven most common causes, how to diagnose each at home, and when to call Parobek Plumbing & Air Conditioning for same-day help. We service central AC, heat pumps, and ductless mini-splits across the Austin–Bastrop corridor.

1) Dirty air filter choking airflow

A clogged filter starves the system of airflow. Low airflow prevents enough warm air from passing over the evaporator coil, so your AC cannot remove heat. The result is long run times and weak cooling.

What you can do now:

1. Turn the system off at the thermostat.
2. Check the return grille or air handler for the filter.
3. Replace with the correct size and MERV rating. Most homes do best with MERV 8 to 11.
4. Restart and give it 15 minutes to stabilize.

Why it matters: Running with a dirty filter can freeze the coil, stress the compressor, and increase energy use.

Review callout:

"Anthony was awesome! He took a thorough look at my AC system, wasnt pushy, and gave me a great report so I can budget upgrades."

2) Thermostat settings or sensor issues

Incorrect settings can make a good system look broken. Fan set to On will run constantly without cooling between cycles. Miscalibrated sensors or poor thermostat placement near a heat source can also confuse the system.

Quick checks:

• Set Cool mode and Auto fan.
• Confirm the setpoint is at least 5 degrees below room temperature.
• Replace batteries if applicable.
• Ensure the thermostat is not in direct sun or near supply vents.

When to call: If you still have erratic temperatures, our techs can test control circuits and install or program a smart thermostat that fits your system and home.

Review callout:

"Al arrived on time on a Sunday, worked quickly, explained the problem, and gave the homeowners choices to resolve the AC issues."

3) Frozen evaporator coil

A frozen indoor coil stops heat transfer. Symptoms include weak airflow or no airflow at the vents and visible frost on the refrigerant lines.

Possible causes:

• Dirty filter or blocked returns
• Low refrigerant from a leak
• Failed blower motor
• Closed supply registers

What to do:

1. Turn the system Off and set the fan to On to thaw the coil.
2. Replace the filter and open all vents.
3. If ice returns, you likely have a deeper issue that needs service.

Professional fix: We check blower amps, inspect the coil, and test refrigerant charge. If there is a leak, we locate and repair it, then recharge to spec.

Review callout:

"Jarret Randle and John Solis figured out what happened and fixed it. Gave me 3 quotes to choose from and were very efficient."

4) Low refrigerant or a refrigerant leak

Refrigerant absorbs heat indoors and releases it outside. If the charge is low or leaking, your AC may run nonstop with little cooling.

Signs to watch:

• Longer cycles and higher bills
• Hissing near the indoor unit
• Ice on the refrigerant lines

Why service matters: Topping off without leak repair is a short-lived fix that can damage the compressor. Our technicians are licensed and follow EPA handling rules to find and repair leaks, then recharge to manufacturer specs for your system.

Review callout:

"Anthony Maldonado was friendly and quickly diagnosed and repaired our AC. He explained the issue and options. We couldn’t be happier."

5) Dirty outdoor condenser coil

Your outdoor unit releases heat to the outside air. When the coil is matted with cottonwood, dust, or grass clippings, the system cannot reject heat and indoor cooling suffers.

Homeowner steps:

• Shut power off at the disconnect.
• Gently hose off the coil fins from the inside out.
• Keep 2 feet of clearance around the unit.

Pro service includes a deeper clean, fin straightening, and testing the condenser fan and capacitor. Clean coils reduce head pressure, improve cooling, and can lower energy use. Seasonal maintenance can improve efficiency by up to 15%.

Review callout:

"Mr. Amy was very professional and knowledgeable. I will definitely recommend Parobek for any AC repairs!"

6) Failing compressor, fan motor, or capacitor

Your AC depends on motors and start components to move refrigerant and air. A weak capacitor or failing motor can make the unit run but move little air or refrigerant.

Warning signs:

• Outdoor fan not spinning or starts, then stalls
• Buzzing or humming at the condenser
• Warm air from vents despite the outdoor unit running

Our diagnostic process:

• Test capacitors under load
• Measure motor amperage and compare to nameplate
• Inspect contactor and wiring
• Verify compressor start and run performance

If needed, we replace the failed part with a like-for-like, brand-approved component. Our fully stocked trucks allow us to fix most problems in a single visit.

Review callout:

"Made an appointment. They figured it out in about 20 minutes and the repair took about 30. Very efficient and friendly."

7) Ductwork or home airflow problems

Even a perfect AC will underperform with bad ductwork. Kinks, leaks, disconnected runs, or closed dampers can starve rooms. Attic flex ducts in Austin and Bastrop often suffer from crushed sections after other trades work in the space.

What you can check:

• Confirm all supply registers are open
• Inspect accessible ducts for crushed or disconnected runs
• Look for gaps or missing insulation on attic ducts

Professional solutions:

• Pressure testing and thermal imaging to find leaks
• Sealing and balancing to restore design airflow
• Adding return air or upgrading filtration to reduce static pressure

Good airflow delivers even cooling and reduces strain on your system, extending equipment life.

Review callout:

"They explained everything in detail and went over all the prices. Very professional and helpful with the finance process for a new AC unit."

When a tune-up solves the problem

Many cooling issues trace back to skipped maintenance. Routine AC maintenance helps keep your air conditioning system running efficiently and extends its lifespan. Our maintenance services include: Checking drain lines; Inspecting blower components; Inspecting the outdoor condenser coil; Checking refrigerant; Changing filters; Adjusting the thermostat; Tightening electrical connections.

During a seasonal tune-up we also clean coils, lubricate moving parts, test thermostat accuracy, and perform system performance testing. Seasonal maintenance can reduce the risk of costly repairs and improve your system’s efficiency by up to 15%.

What to expect from a Parobek repair visit

• Same-day emergency repairs and live answering 24/7 in many service areas
• Upfront pricing before we start
• Licensed, background-checked technicians who arrive in uniform
• Fully stocked trucks and a local warehouse so most fixes are done in a single visit
• Service for central AC, heat pumps, ductless mini-splits, and even light commercial systems

Local insight: In the Austin, Elgin, and Bastrop area, cottonwood and oak pollen spike in late spring. That is prime time for clogged filters and dirty outdoor coils. A quick pre-summer check prevents mid-July no-cool calls.

DIY checks before you call

1. Replace the filter and open all supply registers.
2. Set thermostat to Cool and Auto, then lower the setpoint 5 degrees.
3. Inspect the outdoor unit. Clear debris and gently rinse the coil.
4. Look for ice on the lines. If present, turn the system Off and set fan to On to thaw.
5. Verify the breaker is on and the outdoor disconnect is seated.

If these do not restore cooling in 30 minutes, schedule service. Fast action protects your compressor and saves money.

Avoid the repeat problem with proactive care

• Enroll in our Friends & Family Club. This helps keep maintenance on schedule and supports long-term system performance, all while providing you with discounts and perks.
• Schedule spring and fall tune-ups to catch issues early.
• Ask about smart thermostats and IAQ upgrades that improve comfort and protect your system.

Hard facts you can trust:

• Licenses: M-17953 and TACLB136431E
• Multi-year Best of Bastrop winner for HVAC and plumbing
• Documented maintenance gains of up to 15% efficiency improvement

Frequently Asked Questions

Why is my AC running but not cooling after I changed the filter?

If the evaporator coil froze before you changed the filter, it must thaw fully. Turn the system Off and set the fan to On for 2 to 3 hours. If ice returns, call for service.

How long should my AC run to cool the house?

On a hot Austin afternoon, normal cycles can last 15 to 20 minutes. If it runs nonstop with little temperature drop, you likely have an airflow, refrigerant, or coil issue.

Can low refrigerant damage my AC?

Yes. Low charge overheats the compressor and can cause early failure. A licensed tech should find and fix the leak, then recharge to factory specs.

Is it safe to hose off my outdoor unit?

Yes, with power off. Use gentle water flow from the inside out. Avoid pressure washers and protect electrical panels. Annual professional cleaning is recommended.

Do you service ductless mini-splits too?

Yes. We repair, maintain, and install ductless systems. We also offer a mini-split repair diagnostic and full tune-ups for multi-zone setups.

In Summary

If your AC is running but not cooling, start with airflow and thermostat checks. If cooling does not return, Parobek can diagnose refrigerant, coil, or motor problems the same day. We serve Austin, Bastrop, Elgin, Manor, Buda, and nearby communities.

Call or Schedule Now

Get fast, expert AC repair near you. Call (512) 937-1747 or visit https://www.parobekplumbing.com/ to book online. Ask about our Friends & Family Club for ongoing savings and priority service.

Ready for reliable cooling today? Call Parobek Plumbing & Air Conditioning at (512) 937-1747 or book online at https://www.parobekplumbing.com/. Same-day emergency repairs available. Enroll in our Friends & Family Club for discounts and perks.

Parobek Plumbing & Air Conditioning is family owned and operated with 100+ years of combined experience. We are licensed and insured (Licenses: M-17953 | TACLB136431E). Homeowners trust our upfront pricing, same-day emergency service, and fully stocked trucks that fix most problems in one visit. We back our work with industry-leading warranties and a 100% Satisfaction Guarantee and have thousands of 5-star reviews. Proud multi-year Best of Bastrop winner, serving Austin, Bastrop, Elgin, Manor, and nearby communities.