Question about Coleman Mach 15 Air Conditioner

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COLEMAN TSR MACH 3 COMPRESSOR

I believe I'm having the same problem. I just bought a used travel trailer equipped with the Coleman TSR Mach 3. We started using the a/c this past Saturday morning and was working fine until about 2:00 pm when the sun was directly over the camper. Then the compressor kept shutting off and when it tried to kick back on it just couldn't. So we turned it off and when the sunset and everything cooled off we started it back up and it ran all night long because we stayed in it just to make sure. We left it running all day Sunday until 2:00 pm came again and the compressor shut off again. Again when it cooled it ran fine. Now two days later it will run for about an hour and it will cut off and when it tries to come back it just cant't make it. Nothing is tripping inside the camper or the house, water is also dripping from atop the camper so I don't guess it is freezing up. Could this be something major? Please help I hate to buy a new one

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  • Wayne 14 Jun 12, 2008

    The air conditioner runs but the compressor will not kick in or start!

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I would check the thermostat based on what you said it could be out of calibration

Posted on Jun 11, 2008

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  • 54 Answers

SOURCE: coleman tsr mach 3 RV Air Conditioner

I don't think you need a new one just a good cleaning and service. The unit has a liquid high temperature line near the compressor with a fan blowing outside air across it this coil gets clogged over time with air-borne dirt and pollen and leaves and such and must be cleaned regularly or the unit will be unable to remove the heat from the coil and during the peak demand (3pm) the circuits that protect the compressor and the trailer wiring from being overloaded and burning or melting will trip. From what you have described it sounds like the RV is working as it should with a condenser coil that needs to be cleaned. GL and happy camping!
P.S. I've only serviced the occasional RV unit but in those cases I laid a piece of plywood on top of the Rv for work platform removed the retaining screws from the top cover and used a spray bottle with a good heavy foaming cleaner a shop-vac and a brush to get the job done.

Posted on Jun 11, 2008

SOURCE: Coleman Mach 3 Rv air conditioning

Dirty coils might be your problem. You might have a refrigerant problem as well. Try cleaning it first then have a tech put gages on it. Doesn't sound too serious

Posted on Jun 12, 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!

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Dirty coils might be your problem. You might have a refrigerant problem as well. Try cleaning it first then have a tech put gages on it. Doesn't sound too serious

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2 Answers

Coleman tsr mach 3 RV Air Conditioner


I don't think you need a new one just a good cleaning and service. The unit has a liquid high temperature line near the compressor with a fan blowing outside air across it this coil gets clogged over time with air-borne dirt and pollen and leaves and such and must be cleaned regularly or the unit will be unable to remove the heat from the coil and during the peak demand (3pm) the circuits that protect the compressor and the trailer wiring from being overloaded and burning or melting will trip. From what you have described it sounds like the RV is working as it should with a condenser coil that needs to be cleaned. GL and happy camping!
P.S. I've only serviced the occasional RV unit but in those cases I laid a piece of plywood on top of the Rv for work platform removed the retaining screws from the top cover and used a spray bottle with a good heavy foaming cleaner a shop-vac and a brush to get the job done.

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3 Answers

Coleman tsr mach 3 RV Air Conditioner


the fan motor bearings need lub....the shaft has a tiny access hole to put some oil into. because the fan shaft is slowing down, it is putting more strain on the voltage current, and eventually the internal breaker shuts down the ac........plus your condenser is not getting enough air accross it, compressor heats up, and it too will shut the unit down......older units have to be oiled every year, and eventually it too will fail, and a new blower motor assembly is needed or replace the ac unit.....blower motor units are around $130....now you install it or pay to have it done at around another $150 labor,,,,,try yourself, if it fails then call the tech........let me know ..ray..yyzazz@ao.com

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