Why is my AC running but not blowing cold air?

Nine times out of ten it's one of four things: a failed run capacitor, a burned contactor, a condenser fan that isn't spinning, or low refrigerant from a leak. A technician can tell them apart in minutes by checking the capacitor, the voltage at the contactor, and the pressures — but only the first three are cheap fixes, so it's worth diagnosing rather than guessing.

Alpha & Omega HVAC Appliance Repair · Orange County, CA

AC & Air Conditioning Repair in Orange County, CA

✅ Insured · EPA 608 Certified Technicians
⭐ 200 Yelp Reviews · 5.0★ Google
🛡️ 90-Day Parts & Labor Warranty
📅 Family-Owned Since 2005
❄️ EPA 608 Universal Certified

Quick answer

Alpha & Omega repairs residential air conditioners across Orange County — blowing warm, won't start, frozen refrigerant lines, water around the indoor unit — and the AC service call is free, so a diagnosis costs you nothing. Our work is limited to minor service and repairs under $1,000: capacitors, contactors, thermostats, coil cleaning, drain lines and small refrigerant repairs. We do not install or replace systems. Repairs carry a 90-day parts and labor warranty; if your unit runs but only blows warm air, start with why an AC blows warm air.

Technician checking a central AC condenser unit at a home

When an Orange County summer hits triple digits inland, a dead air conditioner stops being a comfort problem and starts being a health one — especially in a house with kids, seniors, or pets. We repair residential air conditioning systems across Irvine and Orange County: central AC, heat pumps, mini-splits, and package units. Same-day service is usually available, and we carry the parts that fail most often — capacitors, contactors, and fan motors — on the truck.

AC Problems We Fix

AC running but blowing warm air — the most common summer call. Usually a failed run capacitor, a burned contactor, a stuck condenser fan, or low refrigerant from a leak.
AC won't turn on at all — tripped breaker, blown low-voltage fuse on the control board, failed thermostat, or a safety switch that opened (often the condensate float).
Ice on the refrigerant line or indoor coil — restricted airflow from a clogged filter or dirty coil, a weak blower, or an undercharged system. Shut it off and run the fan only; running it iced can destroy the compressor.
Water leaking from the indoor unit — a clogged condensate drain line, cracked drain pan, or a frozen coil melting off. Common in Orange County, where dust and algae plug drain lines every couple of seasons.
Weak airflow from the vents — dirty filter, failing blower motor or capacitor, collapsed flex duct, or a badly leaking duct run in the attic.
Outside unit hums but the fan doesn't spin — classic failed capacitor or seized condenser fan motor. Don't let it keep humming; that's hard on the compressor.
Short cycling — the system starts and stops every few minutes. Can be an oversized system, a dirty coil, low charge, or a failing pressure switch.
Breaker trips every time the AC starts — a hard-starting compressor, a shorted fan motor, or a genuine electrical fault. Stop resetting it and get it diagnosed.
Burning or musty smell when it runs — overheating motor, or mold in the evaporator/drain pan.
Loud grinding, screeching, or rattling — failing motor bearings, a loose blower wheel, or debris in the condenser.

Quick Checks Before You Call

Set the thermostat to COOL and drop it 5° below room temperature — a system in AUTO or FAN-ON confuses a lot of diagnoses.
Replace a dirty filter. A clogged filter causes more no-cool calls than any single part.
Check the breaker — and note whether there are two: one for the indoor air handler, one for the outdoor condenser.
Look at the outdoor unit: is the fan spinning, and is the coil packed with dust, leaves, or cottonwood?
Check the thermostat batteries if the screen is blank.

⚠️ Stop and call: if you smell burning, see scorch marks at the disconnect or contactor, hear the breaker trip repeatedly, or find ice on the lines. Refrigerant work is EPA-regulated and requires a certified technician — never attempt to add refrigerant yourself; topping off a leaking system just wastes money and vents refrigerant.

What a Repair Visit Looks Like

We confirm the symptom, then check thermostat calls, voltage at the disconnect, and the control board — not just the obvious part.
We take refrigerant pressures and temperature split before quoting anything sealed-system related.
You get the price before we start. No surprise line items afterwards.
Common parts — capacitors, contactors, fan motors, float switches, thermostats — are on the truck, so most repairs finish the same visit.
Repairs carry a 90-day warranty on parts & labor, with up to 5 years on select parts, confirmed on-site by the technician.

Systems & Brands We Service

Central split systems, heat pumps, ductless mini-splits, and package units — Carrier, Trane, Lennox, Goodman, Rheem, American Standard, Bryant, York, Daikin, Mitsubishi, Fujitsu, LG, and most other brands you'll find on an Orange County roof or side yard. Our technicians are EPA Section 608 Universal certified for refrigerant work.

Service Area

Air conditioning repair in Irvine (we're based there), Tustin, Lake Forest, Mission Viejo, Costa Mesa, Newport Beach, Anaheim, Santa Ana, Huntington Beach, Orange, and throughout Orange County — each city page covers the AC problems we see most there. Want to avoid the breakdown entirely? See AC maintenance & tune-up. Air conditioner completely dead? Start with AC not turning on — what to check first; ice on the lines or water on the floor, see AC freezing up and AC leaking water. Running a restaurant, office, or retail space? See our commercial HVAC & rooftop AC repair page. For heating and full-system service, see HVAC repair & maintenance, or read the guide on why an AC stops cooling.

How fast can you get out for AC repair in Orange County?

Same-day service is usually available, and in a July heat wave we try to prioritize households with seniors, infants, or medical needs. Call (310) 600-8152 and tell us what the system is doing.

Is it worth repairing an old AC or should I replace it?

Rough rule: if the system is under 10 years old, repair almost always wins. Past 12–15 years, if it's on R-22 refrigerant, or if the compressor itself has failed, replacement usually makes more financial sense. We'll tell you honestly which side of that line your system is on — we don't sell you a system you don't need.

Can you just add refrigerant to my AC?

Refrigerant doesn't get used up — if it's low, there's a leak. We can add charge to get you cooling today, but without finding and fixing the leak you'll be calling again in a few months, and venting refrigerant is against EPA rules. We'd rather locate the leak.

Do you cover the repair with a warranty?

Yes — 90 days on parts and labor as our baseline, and up to 5 years on select parts. Your technician confirms the exact coverage on-site before the work starts.