FURNACE & AC · AC REPAIR
AC Repair in Morgan Hill, CA
Air conditioning repair for Morgan Hill homes: what actually fails on a central AC here, what a thorough diagnosis should measure, and how to tell when another repair stops paying off.
Quick answers
- Run capacitors, contactors, dirty condenser coils and refrigerant leaks are common causes of no-cool problems.
- Refrigerant is not consumed in normal operation: a correctly charged system that loses it has a leak, and a top-off without diagnosis is not a permanent fix.
- Ice on the lineset is an airflow or charge problem, not a sign the system is 'working hard'.
- Warm rooms are often duct leakage or undersized return air rather than a failing outdoor unit.
- Ask for the measured numbers: temperature split, static pressure and refrigerant readings.
Common air conditioning problems
Long, dry South Valley afternoons put sustained load on cooling equipment, and the failures that follow are fairly predictable: electrical components that give out mid-season, coils that have quietly collected dust and grass clippings, condensate drains that clog and trip a safety switch, and refrigerant leaks at service valves or the evaporator coil.
AC not cooling
When the system runs but the house never reaches setpoint, the first measurements are temperature split across the coil and static pressure in the duct system. A low split with normal airflow points toward charge or compressor capacity; a high static pressure points at filters, a dirty evaporator coil, or ducts that were never sized for the equipment.
AC blowing warm air
Warm air at the registers usually means the refrigerant circuit is not moving heat: a leak, a failed compressor, a burnt contactor that never energised the outdoor unit, or an evaporator coil frozen solid because airflow dropped. Turning the system to fan-only lets ice thaw so a technician can actually take readings.
AC won't turn on
Thermostat settings and batteries, the switch at the furnace or air handler, and the breaker are worth checking first. After that, a failed run capacitor, a full condensate pan holding a float switch open, or a blown low-voltage fuse on the control board are all possible causes.
AC short cycling
Starting and stopping every few minutes is hard on a compressor. Restricted airflow, low charge, an oversized system, or a failing control are the usual causes. HVAC system sizing explains why an oversized air conditioner never runs long enough to do its job properly.
Refrigerant leaks
Refrigerant is not consumed in normal operation. If a correctly charged system loses refrigerant, there is a leak; a system that was never charged correctly can also test low. A top-off without diagnosis is not a permanent fix. On older R-22 equipment, the cost and availability of refrigerant frequently change the arithmetic toward replacement.
What a real AC service visit includes
A thorough visit covers coil inspection and cleaning, refrigerant charge verified by measurement rather than by feel, capacitor, contactor and wiring checks, condensate drain clearing, filter and blower inspection, and temperature-split and airflow readings. You should be shown the numbers, not just handed a verdict.
Repair or replace your air conditioner?
On a newer air conditioner in otherwise good condition, repairing a single failed component can often make sense. As equipment ages and repair costs rise — compressor failure, a leaking evaporator coil, or large refrigerant repairs on obsolete equipment — comparing the repair against replacement becomes more important, because the surviving components carry similar wear. Repair vs. replace walks through the factors, and HVAC system lifespan covers what to expect from equipment age here. When replacement is the answer, AC installation walks through sizing and equipment choice.
Fewer breakdowns next summer
Change filters on schedule, keep the outdoor unit clear of shrubs and debris, and have cooling serviced in spring rather than during the first heat wave. Heating problems on the same system are covered on furnace repair in Morgan Hill.
Air conditioner not cooling?
Describe what it's doing and we'll get a service visit booked to diagnose it.
Common questions
My AC runs but the house never gets cool. What's wrong?
The usual causes are a refrigerant leak, a dirty condenser or evaporator coil, restricted airflow from filters or ducts, or a weak capacitor leaving the compressor struggling. A technician should measure temperature split, static pressure and refrigerant readings rather than guess.
Why is my air conditioner blowing warm air?
Warm air at the registers while the outdoor unit runs usually points to a refrigerant problem, a failed compressor or contactor, or a frozen evaporator coil caused by low airflow. If ice is visible on the lineset, shut the system off and run the fan only so it can thaw before a technician arrives.
My AC won't turn on at all.
Check the thermostat batteries and mode, the furnace or air handler switch, and the breaker before calling. Beyond that, a failed run capacitor, a tripped float switch on a full condensate drain, or a blown low-voltage fuse are the common culprits.
Why does my AC turn on and off every few minutes?
Short cycling typically comes from restricted airflow, low refrigerant charge, an oversized system, or a control fault. It's worth diagnosing quickly because repeated starts are hard on the compressor.
Can you just add refrigerant?
Refrigerant is not consumed in normal operation. If a correctly charged system loses refrigerant, there is a leak; a system that was never charged correctly can also test low. A top-off without diagnosis is not a permanent fix.
Is it worth repairing an older air conditioner?
It depends on the system's condition, the cost of the repair and what else is likely to need attention. On a newer air conditioner in otherwise good shape, repairing a single failed component often makes sense. Larger repairs — compressor failure, a leaking evaporator coil, or significant refrigerant work on an obsolete R-22 system — are worth pricing against replacement before you commit.