AC Running but Not Cooling: Hemet Troubleshooting
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An AC that runs but doesn't cool usually has a clogged filter, a dirty outdoor coil, a failed condenser fan or capacitor, low refrigerant from a leak, or leaky ductwork. Check the filter and clear around the outdoor unit first. If the air from the vents is still warm, a technician needs to test pressures and electrical parts.
Last reviewed October 19, 2026.
What usually causes warm air from the vents?
- Dirty filter: restricts airflow, cuts cooling, and can freeze the coil.
- Dirty outdoor coil: dust, cottonwood fluff, and weeds keep the condenser from shedding heat.
- Condenser fan not spinning: often a bad capacitor or fan motor. The compressor overheats without it.
- Low refrigerant: refrigerant doesn’t get used up, so low charge means a leak. See refrigerant leaks.
- Compressor not running: the fan spins but the unit isn’t cooling; often a capacitor, contactor, or compressor problem.
- Duct leaks: cool air escaping into a hot attic.
- Undersized or aging system: an older system may struggle to keep up on the hottest afternoons.
How do you tell what’s wrong?
Go outside while the AC is calling for cooling. If the fan on top is spinning and the unit is humming steadily, the compressor is probably running. If the fan isn’t spinning, or the unit hums without starting, turn the system off and call; running it that way can damage the compressor.
What do these repairs cost?
HomeGuide national estimates: capacitor $100 to $250, condenser fan motor $200 to $700, refrigerant leak repair $200 to $1,500, recharge $100 to $600, compressor $600 to $2,500, coil cleaning is often part of a $70 to $200 tune-up.
When should you call an emergency AC pro in Hemet?
Call for urgent help, and call 911 first where noted, if any of these apply:
- Someone has signs of heat stroke: confusion, slurred speech, fainting, very high body temperature, or hot skin. Call 911 and start cooling them right away.
- The AC is out during a heat wave and someone at home is an older adult, an infant, pregnant, or has a medical condition that heat makes worse.
- The outdoor unit or air handler smells like burning, sparks, or keeps tripping the breaker. Turn the system off at the thermostat and breaker.
- Water is leaking from the air handler into ceilings, walls, or flooring.
- The AC runs but indoor temperatures keep climbing on a hot day.
- You smell gas near a gas furnace or package unit: leave and call 911 or SoCalGas from outside.
If someone shows signs of heat stroke, or you smell gas, call 911 first. Don't wait for a contractor.
Where is ac not cooling help available near Hemet?
Requests are taken from Hemet and these nearby communities:
What do people ask about AC repair in Hemet?
Why does my AC cool in the morning but not in the afternoon?
On the hottest afternoons, a system with a dirty coil, low charge, or leaky ducts falls behind. It can also mean the system is undersized for the home.
Can I hose off my outdoor unit?
Gently rinsing the outside of the condenser coil with a garden hose (power off first) is a common homeowner task. Don't use a pressure washer, which can bend the fins.
Is low refrigerant normal?
No. AC refrigerant circulates in a closed loop. If it's low, there is a leak that should be found and repaired.
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