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Central air/heat pump not putting out cold air

I have a air conditioner/heat pump that is blowing air out of the vent but the air isn't cool. It was working fine a few days ago, but it completely stopped blowing cold air out today. We have taken the cover off and there are no loose wires that i can see. Any ideas are appreciated.

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  • mandydawn08 Jun 22, 2009

    Okay, I have checked all of that and everything seems fine. Are there any sensors or resets? The compressor seems to be humming but doesn't act like it is kicking on all the way. The lines running out of the compressor aren't even cold. Thanks for your suggestions!

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I have some things for you to check. If you look at the outside unit the lines going into the house. Are they frozen? Have you had any yard work done, the reason I ask is they could have accidentally cut or pulled out the thermostat wires to the ac unit. Also, inside check for the same thing, frozen lines. Also, you may want to check the drain coming from the inside unit, it may be clogged.

Posted on Jun 22, 2009

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1 Answer

I have a RUUD gas pack unit.....when you turn on the heat, the blower does not blow any air out of the vents while on "auto". If you put it on "on" it blows cold air out of the vents. What is wrong?


Sounds like the thermostat is hooked up wrong. If the ac doesnt work right its in the thermostat programming or the wiring. Hope this helps good luck

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Central air conditioning unit blows air but not cold air


Hi,

Here is a tip about troubleshooting your air conditioner...
There are many things that can cause your air conditioner not to cool...

Air Conditioner Trouble - Review the Possibilities

heatman101

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REPLACED BOTH ELEMENTS GOT HOT WATER FOR 1 SHOW THEN IT GOT COOLER AND COOLER AND NOW ITS COLD ONLY?


Find a reputable HVAC contractor to do a room by room analysis with heat and cooling loads calculated and units sized and duct requirements and compare to what you have.

The air not being cold is not necessarily an indicator of anything malfunctioning. High efficiency units for instance don't produce cold air.

Since you have had someone look at it, the duct work may be collapsed which restricts air flow or uninsulated which warms up the supply air. Either one is a possibility. Any Cox Cable guys been stompin' around your attic lately? Wouldn't be the first time.

Usually, when the air coming out of the vents is not cold enuf it's because your freon level is low. Probably leaking, but they can usually recharge the freon and it will work for a while. Try another repair company and see if they can recheck the freon level.

We have a high efficiency unit and it produces cold air, so I don't know what previous poster is referring to. Air conditioners are supposed to blow cold air.

Sorry, to tell ya but it is normal if the outdoor temperatures are much below 45 degrees. Below 45 degrees there is little heat outdoors for the heat pump to grab to heat the home so it will run 24/7 and blow cool or cold air. Below 45 the temp of the air coming out the vent will decline and you will get no heat from the heat pump itself as you near freezing.

Your emergency heat or auxiliary heat is electric strip heat. But it only kicks in during normal operation if the temp in the house drops 3 degrees below the setting. (some tstats if can be 5 deg.) Otherwise the heat pump will blow cool or cold air the rest of the time if it is too cold out.

To prevent it from running all the time and blowing cold it is recommended if the temp outside is falling below 45 degrees you should just switch to the emergency heat setting, which shuts the pump outdoors off, and just heat with the electric.

But if there is no heat outside the heat pumps will blow cold. They are the cheapest and most efficient forms of heat but only as long as the outdoor temp is above that 45 deg..

I'm guessing that if you haven't experienced this you live in some place with moderate winter temperatures like in Northern Florida and rarely get very cold winter temps like the freezing you have seen there recently.

It will likely blow much warmer when the outdoor temp rises.


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It sounds like the unit is stuck in the heat mode or the thermostat switch is still on heat. If the switch is in cool then you can go to the outside unit and locate the reversing valve. It may be stuck in the heat position. You can tap it with the handle of a screwdriver but only on the ends and very lightly because if you dent it the valve will be stuck for sure. If it shifts you will hear a loud hiss as the pressure equalizes. You could also try unplugging it from the circuit board. On some units it is energized in the cool mode and on others it is energized in the heat mode.

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Visually inspect the duct run connections to the main trunk. It is possible that they have loosened and are losing air under the house. Also inspect the duct runs from the trunk connection to the vent connection. You want to check for any damage or other failure. It is rare to find dampers in individual runs in residential duct systems; however, it is another possibility.
http://www.youtube.com/watch?v=28ru4mlFMpI

I hope you find this information helpful. Good Luck in your endeavor! :-)

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