Why is My AC Running But Not Cooling? 7 Common Causes & Fixes

During peak Chennai summer, there is nothing more frustrating than an AC that runs continuously but blows warm or room-temperature air. At **ChillFix Air Solution**, our technicians diagnose over 2,000 cooling issues every year across Chennai. Here are the 7 primary reasons why your AC is not cooling and how to resolve them. --- ### 1. Extremely Clogged Mesh Filters When dust and moisture build up on indoor AC filters, air cannot circulate across the cooling coils. This starves the blower of airflow, causing ice formation on coils and warm room temperatures. **Solution:** Remove the front plastic panel and wash the mesh filters with clean water every 4 to 6 weeks. --- ### 2. Refrigerant Gas Leak (Low Freon / R32 Level) Refrigerant gas circulates in a closed loop to absorb heat. Coastal salt air in Chennai can cause micro-corrosion on copper coils, creating tiny pinhole leaks. **Symptoms:** - Hissing sound near outdoor unit - Ice formation on thin copper pipe - Air feels slightly warm despite setting AC to 18°C **Solution:** Professional [AC Gas Leak Repair & Refilling](/services/ac-gas-filling-chennai) with nitrogen pressure testing. --- ### 3. Faulty Outdoor Capacitor The capacitor provides the electrical boost to start the compressor motor. Voltage fluctuations during Chennai summer grid loads can blow the capacitor. **Solution:** Replacement of the dual run capacitor by a certified technician. --- ### 4. Heavy Dirt Accumulation on Outdoor Condenser Coils If the outdoor unit fins are covered in mud, leaves, or dust, heat cannot escape into the outside atmosphere, forcing the compressor to shut down due to thermal overload. **Solution:** High-pressure jet wash cleaning of the outdoor unit. --- ### 5. Thermostat Sensor Calibration Issue A malfunctioning temperature sensor inside the indoor unit may signal to the controller that the room is already cool, shutting off the compressor prematurely. --- ### Need Urgent AC Repair in Chennai? Don't suffer in the heat! [ChillFix Air Solution](/services/ac-repair-chennai) dispatches certified technicians to your doorstep within 2 hours across Chennai. Call us at **+91 90804 95932** or book via WhatsApp.