Discover the Causes Behind A/C Blowing Warm Air

6 Reasons Why Your AC Might Be Giving You the Warm Shoulder · Dirty filter · Frozen evaporator coils · Clogged condenser coils · Faulty AC fan. you probably have a small leak in the system. lower refrigerant pressure means it can't work as efficiently. while you're driving, you have ... like max a/c? Does it blow cold when in the middle of the cold or just a couple clicks from the end? CURRENTLY WORKING ON A RIDGE WITH A/ ... The A/C will be blowing cold air just fine, then all of a sudden it starts blowing warm air. What I haven't determined yet, is if it starts blowing warm air ... Why Is My AC Blowing Out Warm Air? · How Your Air Conditioner Works · Your Thermostat's Set Improperly · Clogged Air Filter · Low Refrigerant. Faulty Compressor or Compressor Clutch ... Should the compressor or its clutch be found to be at fault, it's likely that your car is blowing hot ... The first step in handling a malfunctioning air conditioner is to check if the thermostat is set to “heat” or “cool.” The A/C blows warm. I have checked the condenser fan to see that it is spinning when in park, it is. So next thought was to do a re-charge. The most frequent culprit behind an A/C blowing warm air is low refrigerant levels. Refrigerant is essential for absorbing heat from the air inside your home. First step is verify high and low A/C pressures using a manifold gauge set. Second is to measure the gap on the A/C clutch.