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AC Fan doesn't blow cold air, frozen coil noticed outside, resetting power resolves temporarily

Air Conditioner Fan intermittently stops blowing cold air into the house. When the fan stops blowing, we notice that the cooling coil connected to the AC unit is frozen. If we reset power to the AC unit and the furnace, it begins cooling again. This behavior is starting to occur about every day now. Have replaced thermostat and the issue still occurs. The breakers to the unit and furnace don't ever trip when this happens either. Not sure what the problem could be.

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  • cnugget23 May 30, 2009

    We had an a/c technician come by the home a few days ago. He checked all parts of the system....pressure/charge/etc. And said everything seemed to be operating properly. He did notice that a (run?) capacitor in the furnace was getting weak and replaced that.

    We put new, clean air filters in as well, but still seeing this behavior. I'd appreciate any other suggestions.


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When the fan stops blowing, we notice that the cooling coil connected to the AC unit is frozen. That statement says a lot, The evaporator fan motor is failing which is causing the coil to freeze up. Voltage and amperage to the fan motor needs to be checked at the motor, sounds like the motor may be overheating and tripping off. The fan also should be checked for drag as a bad bearing could cause this issue. If all of the above checks out motor may need replaced.

Posted on Jan 11, 2013

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You need to call a reputable service technician.  The freezing up usually is associated with a low refrigerant charge or low air flow.  Check your return air filter and replace as needed.

Posted on May 30, 2009

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