Question about Coleman Mach 15 Air Conditioner

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Fan is not blowing cold air

Fan blows fast, filters are clean, outside fins are clean. NO COLD AIR Does anyone have an suggestions? Thanks

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  • gokartracer2 Feb 12, 2009

    also i am not hear the compressor even try to come on.

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  • Master
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Sounds like the freon is gone in the system. These small system will lose freon and then you get air and nothing else

Posted on Feb 12, 2009

  • Jeremy Reddick
    Jeremy Reddick Feb 12, 2009

    If you are not hearing the compressor then, the compressor is shot.You know that the unit is getting power so the compressor would be getting power also. Either get a tech to replace the compressor about 200 dollars or replace the unit.

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My window air conditioner is not cooling at all, even though the fan works and I hear the motor humming.


Here's a pretty simple test - take off the cover if possible, remove the air filter - I know some it's trickier on some and they have a filter that slides in from the side versus a hinged cover, etc. you can pull off or down - but there are metal fins behind that filter. Turn the A/C unit on and try and feel those fins. If they are getting cold and your fan is on - it should be drawing hot air in right there, cooling it down and cool air should come out of the vent. If you turn the A/C on and feel those fins - hear the humming - but they are not getting cold - you have a bigger issue. Basically, your compressor isn't sending refrigerant through the coils and there's nothing to cool the air down with. *Could be other components - but that's a pretty basic test just to check functionality. If it's getting cold - but you're not blowing cold air - those fins could just be clogged with dust, etc. You have to be careful cleaning those as they bend easily. They sell special cleaner for them (you'll want to use it outside - usually an acid based cleaner) and a device that looks like a comb to get in between the fins to straighten if they get bent. Word to the wise - those fins being straight and clean allow the air flow to come through unrestricted - definitely less is more on the cleaning side; you'll want to be very careful. All The Best and Good Luck - Fins to check temp below -
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Sorry to hear of your problem.

This is a common issue, and have just experience the same in my home. I am also an HVACR service tech, and will outline the most common problem that causes this.

If it blows cold air, your compressor is working fine. For a certain reason your compressor is turning off.

The compressor needs constant cooling of the motor and its windings. The compressor is also equipped with an overload switch (this turns the compressor off when temperatures inside get too hot). This is probably what is happening in your case.

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