Question about Coleman Mach 15 Air Conditioner

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Compressor lines Compressor linews are freezing up and the unit a Coleman Mach is not blowing much cold air. Is there a charging port or some sort of hot bypass at all ?

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  • Frank Spencer Jun 30, 2008

    2003 Colemna Utah cp, Coleman Mach AC unit is not putting out cold air can you help me? the fans runs great and you can hear the compessor kick on.But no cold air. and it is not very cool.

    Can you recharge it yourself. And what does it take.




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If the large line returning to the compressor is frosting you don't have enough air circulation. Check air filters on inside unit.

Posted on May 13, 2008


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I have a 2010 30' cougar travel trailer, we have never used the air conditioner which is a coleman mach model, when I put it on auto and cool it blows cool air but never gets cold am I suposed to

Check the temperature of the air coming out the vent If it's more than 10 degrees below the air going in it's ok. If it's the same temperature, the condensing system may be not working. The compressor may just be a quiet one!

May 18, 2012 | Coleman Mach III Air Conditioner

1 Answer

Coleman compressor runs no cool

Sounds like a blockage, which isn't permanent and let the unit cool the other day. Reclaim the gas, cut the capillary at the drier end and blow nitrogen through. Rebraze the capillary, vacuum and put new gas in.

May 15, 2012 | Coleman 13.5K MACH 3-WHITE

1 Answer

I have a 85 coleman a/c unit (6759b714) it started blowing hot air,was cold. what kind of freon do I need? and is the fitting universal?

It's a closed system, no fittings. You can have system recharged but would need to evacuate, cut lines , solder on fittings, re-charge etc and that gets pretty expensive. Usually better off to replace with new and get warranty with it. Do you hear compressor even trying to kick in? It may be something less expensive. Give me a quick rundown on when it ran good last, what appears to be happening now. Maybe I can help.

Aug 29, 2011 | Coleman Mach III Air Conditioner

1 Answer

My coleman 13,500 roof a/c year 2000 does not blow as cold as used to. I have cleaned the top condenser coils, with no help. It also at times will seem to pull a heavy load when I assume the compressor...

if the compressor started and stoped means
1 thermostat need settings
2 compressor over heated due to low suction pressure need to check and repair the leak then charge the freon

Sep 14, 2009 | Coleman Mach III Air Conditioner

1 Answer

Coleman mach 3 rv roof mount ac

You will need 12 vdc (battery or converter) for controls to work, and 115 VAC (hydro) for fan & compressor to work. With your fan obviously working, that tells me you have both already but compressor may not be kicking in. Do you hear a "moaning" sound or see lights dim when switched to cool?

Aug 17, 2009 | Coleman Mach III Air Conditioner

1 Answer

Compressor kicks on, but only barely blows any air. Its cold but little to no air is coming out. Then it quits altoghether. Could this be the run capacitor?

it sounds like the unit is low on charge or a bad blower motor turn the ac off and turn just the fan on does it blow out any air?
check your filters to make sure they are clean
if these are both ok i would call someone certified to check refrigerant levels

Aug 04, 2009 | Coleman Mach 15 Air Conditioner

1 Answer

A.c compressor kicks on and off

How long has it been there, without experiencing any problems? This just start recently? Have you cleaned intake air filters at ceiling? Fan keeps running?

Jul 18, 2009 | Coleman Mach 15 Air Conditioner

1 Answer

Recycling to soon?

sounds like the unit is low on freon. it will need to be serviced so the leak can be fixed then recharged.

Jun 01, 2009 | Coleman Mach III Air Conditioner

1 Answer

Not getting any cool air

Unit works good? Is the compressor coming on but not blowing cold air? If the compressor is running but not cooling, then the main issue is usually with cleanliness of the condenser. Wash it out if this is the case. If the compressor is not coming on, multiple problems could be the reason.

These units do not have service ports as a normal AC does. If you have lost freon then there is a leak in the system somewhere as they are sealed. The process for recharging a rooftop unit is usually expensive and not fail safe. I would recommend a new unit if a leak is discovered.

May 22, 2009 | Coleman Mach III Air Conditioner

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