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AC Not Blowing Cold, Frozen Coil and Capacitor Checks
- By SupplyShop
- On Jun 23, 2026
- Comment 0
If an air conditioner is not blowing cold air but running, do not jump straight to refrigerant or a capacitor. Start with airflow, filter, coil condition, fan operation, drain behavior, thermostat call and visible ice before ordering parts.
Common causes and routes
| Search | What to check | SupplyShop route |
|---|---|---|
| air conditioner not blowing cold air but running | Filter, airflow, outdoor fan, indoor blower, frozen coil, capacitor, thermostat, refrigerant and condensate symptoms. | condenser fan motors |
| frozen evaporator coil | Airflow restriction, dirty coil, blocked drain, low refrigerant, blower speed, metering and controls. | AC evaporator coils |
| AC coil cleaner | Confirm coil type, soil, rinse requirements and whether cleaning will solve the failure. | AC coil cleaner |
| capacitor for AC | Match MFD, voltage, case shape, terminal layout and motor requirements before replacement. | AC capacitors and hard start kits |
| condenser fan motor | Match HP, RPM, voltage, frame, shaft, rotation, enclosure and capacitor requirements. | condenser fan motors |
| AC coolant or Freon AC | Confirm the exact refrigerant on the equipment label and follow refrigerant handling requirements. | refrigerant |
R134A pressure chart checks
R134A pressure chart searches need pressure-temperature data for R-134a, not a generic AC pressure guess. Common saturation references include 70 F at 71.1 psig, 80 F at 86.7 psig, 90 F at 104.3 psig and 100 F at 124.2 psig from the Forane R-134a pressure-temperature chart. Use the chart with the equipment procedure and service conditions.