Question about Coleman Mach III Air Conditioner

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My Coleman rv mach3 63134cst which is about 3 years old won't cycle and freezes up when it runs to long. Ice forms on coils.

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If coils are clean, or have been cleaned recently, then check your discharge side of unit for restriction. It may require you to take down ceiling assy, to be sure that there is nothing blocking the duct work inlets, if it is a ducted system. Also if ducted system, make sure you don't have too many blocked/shut off. As well you should have a freeze probe, or round sensor in the coils at front where intake filter goes over, (evaporator) to sense the frost, and kick compressor out until it thaws. When was the last time the evaporator and condenser (rear) coils were cleaned?

Posted on May 16, 2010

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2 Answers

Short freeze


Ice is to thin. Check to make sure water inlet valve is not letting water go through valve during freeze cycle. Make sure condenser coil is clean and condenser fan is running. Check the hot gas valve to make sure it is not bypassing during freeze cycle.

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Why is air conditioner freezing up


Hi Krystal. Not sure how old your AC is. But mine is 1988 Class C. My roof mount started today freezing up After being on only 1/2 hour or less.I took the cover off AC on roof and seen the cooling coil half full of ice building up. When It get fully packed with ice the inside air cannot pass thru coil to fan to recycle the cooled air back down inside RV.. I checked out this site.Fixya.It seems my AC may be blocked with dust in the cooling coil. So I cleaned it out with compressed air. You can buy a can of it in spray form at Wal-Mart.$5..Also FixYa suggested to change the air filters after you clean the coils. Take off cover in inside on ceiling and put new filters. Peferable ones that are able to breathe thru easly. Mine was pluged with dog dander and a bit of dog hair.. I may have to put my dog..in a bag...No I can't do that... But today and yesteday it was very hot and ******* the AC.. But I did attach a small fan under my AC to push more hot up into coils.. It did make a diference The coils started to thaw and drip water on roof.. But I still have to check freon pressure...I'm attaching a photo of my small fan It is only 5"across...Hoped that helped a little.......John, Cornwall, Ontario
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Jul 03, 2012 | Coleman Mach 15 Air Conditioner

1 Answer

Unit cools great but when extremly hot weather occurs it eventually freezes up.


dirty filters in the indoor unit.As the ambient temperature rises the unit will work harder and longer,its fine when its just a normal day because the evaporator coil wont have time to ice up as the compressor will cycle off before the coil freezes totally,but during extreme ambient temperatures the coil will ice up as the compressor will continue running to reach set-point causing the coil to ice up

Jan 02, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

We have a Mach III coleman AC unit... a little


Sounds like the evap coil is dirty or its low on freon.

Aug 31, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Light works - that's it! Just quit working.


All frost-free refrigerator-freezers have a thing in the system called a Defrost Timer. The thing is a little clock of sorts that tracks accumulated running time. Every 8 hours of run time the thing cycles through a defrost cycle. The defrost cycle is necessitated by the humidity that forms ice crystals on the freezing coils, if the frost is not eradicated it can build up to the point where no air flows over the coils to chill the inside of the box. The Defrost timer in all boxes fails eventually from old age. When that happens, the coils frost over until they become pretty much just a solid block of ice. Your case may however be the exception, as it seems likely that the timer quit during a defrost cycle. Most timers are located on the front of the machine, behind that removable grille under the door. The timer has a round hollow shaft through it, and can be turned with a screwdriver. If the compressor is not running, give the shaft a slow twist until a click is heard. The compressor should start. If it does, check the fridge in 12 hours to make sure it is not stopped again. Sometimes the nudge will make the timer run for a while. You will need to get a replacement timer. If that doesn't make it take off you should call a servicer.

May 20, 2009 | Kenmore 64802 Top Freezer Refrigerator

1 Answer

I have a maytag fridge,its maybe 3 years old,lately it keeps forming a pool of water in the front,the drain pan underneath is always dry,seems to be leaking fron the sises,a drain hose plugged or came off...


This is one of the most common problems that the maytag side by side has. ( Admiral ) The drain in the interior rear gets plugged and all of the defrost cycles over a week or so produces enough water to freeze up and the run over and come out under the basket then on to the floor in front left. If this is your problem, shut of the ref., remove the 2 or 3 baskets and remove the 2 screws holding the lower panel on. Remove the panel, careful not to cut yourself on the coil fins, remove the ice carefully, then use some hot/warm water to the drain area with a baster or something to apply and remove the water until it thaws and the drain clears of ice. Its about a 15 to 20 min. job. good luck.

May 07, 2009 | Refrigerators

1 Answer

Ice forming on condenser copper tubing GE referigerator


is your drain line plugged up under that coil? another thing to check is if the door asket pinched that wold allow ait to infiltrate into the freeze and freeze up the coil. remember to clean under the unit once a year to keep the unit working properly and not having to struggle to condense the refrigerant. Hopt this solution's work for you and have a Happy New Year.

Jan 05, 2009 | GE Profile 21.6 cu. ft. Side-by-Side...

1 Answer

Kenmore Elite 795 75542401


I replaced my "entire" ice cube maker (tube,hoses,water pump, ice maker) and it still pooled water at the bottom. I removed the back panel in the freezer and noticed the ciols go through a defrost cycle and water forms in tray under coils. I removed the lower panel on rear of fridge -and found a drain hose near the water solenoid/pump. I blew compressed air into the hose and hopefully unblocked it so it can drain into the pan not the freezer.

Jul 16, 2008 | Kenmore 73502 / 73504 / 73509 Bottom...

7 Answers

Ice build up in my frost free upright freezer


I looked at the BACK at the bottom underneath of my Sears Kenmore frost free upright freezer and what was causing the ice buildup was very simple. At the factory, the assembler looped the little hose too high and when the water went into the hose it could not get out due to being too high in one spot! An ice dam will form, blocking ALL water coming through
and freezing up any more water coming down giving you a HUGE wad of ice that is scary!!! I just removed the screw holding the loop that holds the hose and put a bit of warm water down the little hole on the INSIDE (Behind the grate) to melt the remaining ice in the tube.You need to take out 4 screws and remove the grate to see this. I could not believe that this was the problem! I haven't had any ice build up since.Now don't tear your freezer apart before you try this trying to fix the compressor, thermostat etc. It may be the only thing wrong with it!

Nov 11, 2006 | Kenmore 16.7 cu. ft. / 473 liter Upright...

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