AC runs but does not cool
The AC runs, but rooms stay warm. Restricted airflow, a frozen coil, outdoor-unit trouble or a refrigerant-circuit problem may be responsible. See AC running without cooling and warm air from vents.
AC Repair in Orange County, CA
AC repair in Orange County, CA
Find the Problem Before Replacing AC Parts
If your AC blows warm air, cycles on and off, leaks water, freezes or will not start, MaksBuilder checks the components involved and explains the repair options. We focus on the cause of the problem, not on replacing parts by guesswork.
Based in Foothill Ranch and serving South Orange County communities.
View repair prices and visit fees
CA Contractor License #1095368
Fault testing before repair
1-year repair warranty
Repair or routine tune-up?
Choose repair for a cooling fault, leak, unusual noise or startup problem. If the system works normally and only needs seasonal service, see AC Tune-Up.
Electrical concern or urgent breakdown?
If a breaker keeps tripping, you smell burning or water reaches electrical parts, turn the equipment off. See Emergency AC Repair.
Common AC problems we troubleshoot
Different AC faults can produce the same symptom. Choose the problem closest to yours; the diagnosis section below explains how we distinguish the possible causes.
Weak or uneven airflow
A clogged filter, restricted return, blower fault or duct leakage can reduce airflow. We check whether the restriction is in the equipment or duct system. Read about weak vent airflow or ductwork services.
Frozen evaporator coil
Ice on the indoor coil often points to insufficient airflow or a refrigerant-side problem. A dirty filter, blower fault or coil condition may be involved. Stop cooling mode while the coil is frozen.
Water near the indoor unit
A blocked drain, condensate-pump issue, damaged pan or melting coil ice can cause water near the unit. A float switch may stop cooling. Turn the system off if water reaches electrical components.
Short cycling
Frequent restarts put extra strain on AC components. Thermostat controls, restricted airflow, overheating motors and an oversized system are possible causes. See why the AC keeps turning on and off.
Thermostat or control problems
A blank display, inaccurate reading, incorrect setting or wiring fault can stop cooling even when the outdoor equipment is functional. Checking the thermostat response and control signal helps isolate the problem.
Buzzing, rattling, or grinding
Rattling can mean a loose panel; grinding may indicate a fan or motor problem. Electrical buzzing can involve a contactor or wiring. Shut the equipment down if you notice burning odors or severe noise.
Outdoor unit will not start
A stopped condenser can point to a power, capacitor, contactor, fan-motor or safety-control fault. Electrical testing distinguishes these causes. Read why an outdoor AC unit will not start.
What We Check During AC Repair Diagnosis
We first confirm what the equipment does when cooling is requested. An outdoor unit that hums but will not start needs different tests from an AC that runs continuously without reaching the set temperature. The checks below are selected for the symptom; they are not a fixed list of parts to replace.
Thermostat and system response
Cooling mode, setpoint, displayed temperature, control response, wiring behavior, equipment staging, and the response of the indoor and outdoor units can be checked when they relate to the complaint.
Airflow and indoor equipment
Filter condition, returns, supply airflow, blower operation, accessible coil condition, icing, and temperature response can help show whether the indoor side is moving enough air through the system.
Static pressure when airflow is abnormal
Static-pressure measurements can show whether the blower is operating against excessive resistance. Additional pressure-drop measurements and inspection may be needed to locate a restriction at the filter, coil, return path, dampers, or ductwork.
Outdoor unit and electrical operation
Condenser startup, fan operation, coil condition, capacitor value, contactor condition, motor current, supply voltage, control signals, disconnects, and safety devices can be tested as needed for the reported failure.
Refrigerant-circuit performance
Once airflow is understood, pressure and temperature measurements may be used to evaluate refrigerant charge, heat-transfer performance, metering-device behavior, compressor operation, and whether leak testing is warranted.
Condensate drainage
For water leaks or drainage shutdowns, the drain line, pan, float switch, condensate pump where installed, visible water path, and drain slope can be checked to identify the actual source of the problem.
Low refrigerant charge is a finding, not the root cause
A properly sealed air-conditioning system does not normally consume refrigerant during operation. If testing indicates an abnormal charge, the next step is to consider operating conditions, previous service history, coil condition, and possible leakage before recommending refrigerant adjustment or a larger repair.
Common AC Repair Pricing
Service visit charges and typical repair prices for residential air conditioners in Orange County.
Standard Residential VisitFREE
Urgent Visit$150
Typical Fixed-Price AC Repairs
| Repair | Typical price |
|---|---|
| AC Capacitor Replacement | $300 |
| Contactor Replacement | $300 |
| Thermostat Repair/Replacement | $300 |
| Condensate Drain Cleaning | $300 |
These are typical prices for the listed repairs after the fault is confirmed. Before approving work, confirm whether replacement parts or additional work are included in your final quote.
Refrigerant Service Pricing
- Service labor
- $200
- R-410A refrigerant
- $125/lb
- R-22 refrigerant
- Quoted individually
Recharging refrigerant does not repair a leak. If the AC is losing refrigerant, the source needs to be investigated before deciding on the next repair.
When repair makes sense—and when replacement should be compared
An isolated capacitor, contactor, fan motor or condensate-drain fault can often be repaired without replacing the entire cooling system, provided testing shows the other major components are sound. Equipment age matters, but it should not be the only reason to replace an AC.
Compare replacement when a compressor or refrigerant coil needs major work, breakdowns keep returning, or suitable parts are hard to obtain. Consider the proposed repair, the condition of the remaining equipment, and whether airflow, ductwork or equipment sizing would still need attention after a replacement.
For a more detailed decision framework, see AC repair versus replacement.
View AC Installation & ReplacementChoose the service that matches the problem
- AC Tune-Up Preventive seasonal service for an AC that is operating without an active cooling failure.
- Emergency AC Repair For urgent cooling failures, repeated breaker trips, electrical concerns, severe new noises, or active water problems that should not wait.
- Ductwork & Airflow For weak rooms, restrictive returns, damaged duct sections, leakage, pressure problems, and uneven air distribution.
- Heat Pump Installation For homes considering a heat-pump system when the existing cooling equipment requires major repairs or replacement.
Customer Reviews
5.0/5Google Reviews ↗
What MaksBuilder Customers Say
“Super helpful, honest and did an amazing job fixing my AC. Thank you so much!”
“Prompt response and prompt appointment. Process of communication was easy and clear. He was able to fix the unit in the same visit.”
AC Repair Service Area in South Orange County
Based in Foothill Ranch, MaksBuilder serves homes across South Orange County. Select your city below for local HVAC service details.
AC Repair FAQ
Why is my AC running but not cooling?
An AC can run without cooling because of restricted airflow, a frozen indoor coil, blower trouble, outdoor-unit failure, an electrical fault, duct loss, or a refrigerant-circuit problem. Several faults can create the same symptom, so the related parts of the system should be tested before a repair is recommended.
Can a dirty filter make an AC stop cooling?
Yes. A heavily loaded filter can restrict airflow across the indoor coil, reduce cooling output, increase runtime, and contribute to coil icing. Replacing the filter may correct a simple restriction, but a frozen coil or continuing airflow problem still needs further inspection.
How much does a common AC repair cost?
A standard residential visit is free, and an urgent visit is $150. Typical capacitor, contactor, thermostat and condensate-drain repairs are $300 each. Confirm the final quote and whether parts are included before work begins. See the full pricing details.
When is an AC problem an emergency?
Repeated breaker trips, burning or electrical odors, water reaching electrical components, severe new mechanical noise, or another condition that may involve electrical or equipment safety should not be treated as routine maintenance. Turn the equipment off when it is unsafe to keep operating and use Emergency AC Repair.
When should I replace instead of repair my AC?
Replacement may be more practical when breakdowns are recurring, a major compressor or coil repair is required, parts are difficult to obtain, or the proposed repair is hard to justify for the system's age and remaining condition. Compare the specific repair findings with heat pump installation options before approving another major repair.
Schedule AC repair in Orange County
Tell us your city and what your AC is doing: no cooling, short cycling, unusual noise or a water leak. If available, include a thermostat error code or equipment model.
Orange County Service Area
Where MaksBuilder Is Based
Based in Foothill Ranch, MaksBuilder serves homes throughout South Orange County.
Looking for your city? View our AC repair service areas.
Call for service
+1 949-740-0410
Working time
Mon–Fri: 24 Hours
Weekend hours
Sat–Sun: 8:00 AM - 6:00 PM
Office area
Foothill Ranch, CA
For urgent HVAC service, call directly or send a request with your city and system issue.
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