A/C not blowing cold through vents.

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Old 07-06-15, 06:25 AM
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A/C not blowing cold through vents.

I have checked all I know how. Compressor and fan are running. Fat cooling line is ice cold inside and out. Small line is warm inside and out. Cleaned coils on air handler. Air coming through coils is cold. Blower is working. Air from vents is at room temp. I am confused because everything seems to be working fine. This started after I had a water leak from pan overflowing. I flushed out the drain and fixed leak. I don't see how flushing the drain could have anything to do with this.
 
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Old 07-06-15, 08:06 AM
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Is this an A/C system or a heat pump? If I understand you correctly, the air passing by the evaporator coil inside the air handler is cold. If the air coming out of the vents is warm, it would indicate that the heat may be on. If it's a heat pump, the heating coils may be on.
 
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Old 07-06-15, 08:43 AM
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It's a all in one unit I guess that means it has a heat pump. The thermostat is on cool. I did see coils up above the blower. Are these the heating coils? I don't know why they would be on when thermostat is set to cool. Should I try to disconnect the wires to the heating element?
 
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Old 07-06-15, 09:54 AM
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If you see coils that look like resistance heating coils, that' probably what they are. If it's a heat pump, which it sounds like it is, there is a reversing valve which determines whether the unit is running in Heat or Cool mode and is controlled by the thermostat. Many heat pumps also have auxiliary resistance heating coils to provide additional heat should the temperature get low enough that more heat is needed than what the heat pump can provide. There is a possibility that the relay that controls the heating coils is "stuck" in the ON position.

If you can easily disconnect the wires from the coils, it's worth a try to see if that gets you cool air. If you do that, just make sure you turn off the power to the unit before doing any work on it. Also, make sure that the disconnected wires don't touch anything (wrap them in tape or something similar). Let us know how you make out.
 
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Old 07-06-15, 12:36 PM
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Well that seems to have worked. I disconnected the heating coil and air is now blowing cold. House is already down 5 degrees. Thanks for your help.
 
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Old 07-06-15, 01:19 PM
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If that took care of the problem then you may have a bad sequencer. It's a device that connects power to the heating coils and looks like a relay with many wires.

If you post the make and model of the air handler we could help you further.
 
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Old 07-06-15, 01:45 PM
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Goodman
Model ARUF18241BA
 
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