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COLEMAN MACH 3 MOUNTING ON INSIDE OF CAMPER NOT ALIGNING WITH MY

I AM INSTALLING A NEW COLEMAN MACH 3 AIR UNIT ON MY 1994 CARRI LITE FITH WHEEL CAMPER AND MY INSIDE PLATE FRO THE DUCTED AIR WILL NOT BOLT UP WHAT DO I NEED TO DO THIS

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Did you purchase a new Ducted Ceiling Unit with the Upper Unit air conditioner? If you are replacing an older mach 3, the ducted ceiling packs are not compatible and you will need to purchase the ceiling pack as well. The ducted ceiling pack part number for the 8333 series Mach III AC is below.

1. Heat/Cool Air Distribution Box - 8330B735
2. Cool only ADB - 8330A733
3. Wall Thermostat (if needed) - 7330G3351

Hope this helps.

Posted on Jul 02, 2009

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Posted on Jan 02, 2017

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Coleman Mach 48000 series roof top A/C in my camper & recently it's been dripping heavily inside the camper. We looked at the top & inside for a clogged line & can't find anything, suggestions?


I had the same problem but it wasn't a clogged drain line, it was the gasket between the roof of the camper and the AC unit. The gasket had shrunk and pulled apart allowing rain water in. To make sure you don't have a clogged drain line when using the AC do you notice water dripping off the camper anywhere besides inside? You should have some drips somewhere on the outside.

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I recently bought a 1992 5th wheel camper made by carri-lite. It's 32 feet long. What is the distance from the hitch to the trailer? What is the weight of this model!


all dimension and other information is available form the manufacturer web page or retail outlet
if not take a tape measure and measure it yourself and take the unit to a public weigh station and weigh it

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If this is a park model trailer like mine, there is a transformer in what they call the ceiling package. It is mounted up inside the return air plenum.

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Where is the drain?


There are grooves on both sides of ac unit on a camper and it drains down the roof to a little gutter that travels the water towards end of camper and drains. Most of the time down the side of camper, but if these Grove are stopped up it will not allow it to drain and cause it to overflow inside camper. If filter is very stopped up or evaporator coil is stopped up, fan not running, low on refrigerant, or having the thermostat set way to low can cause it to freeze up and when this water thaws out it is too much for the drain to handle and also ice could be sticking being the drain pan melting causing it to go in your camper. I would check filter and those drain grooves first.

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My coleman rv ac unit is dripping condensation inside the camper, what is causing that?


It is possible that the drain hole on condensate pan is plugged and causing water to over flow pan. Remove cover from unit and check drain line.Clean coils andpan as best you can and clear drain hole. Add a small amount of bleach to water in drain pan.This will kill any algea or bacteria that may be growing in condensate water and plugging the drain. Thank you

Jun 20, 2011 | Coleman Mach III Air Conditioner

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I installed a new colman mack thermostat in my camper witch has a colman ac unit now ac unit runs 5 min then shuts off for 3 min then starts again and keeps doing this . so I by past thermostat and it will...


if it is a programmable thermostat you can unhook thermostat and when it comes on select 3 instead of 1. As it sounds as though it is short cycling this happens in older houses with drafts. Hope this helps Tim

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I have a 1994 Carri-Lite 633RKS camper with electrical problems


The clicking your hearing from the AC is probably just the 12 volt side of the circuit to run the AC, but it does indicate that the controls/thermostat is doing it's job, but doesn't sound like hydro is getting to AC as well as microwave. I can't imagine those being on the same circuit as far as breaker panel goes, but who knows what might have been done before you got it, unless bought new. Do you by any chance own a plug in circuit/receptacle tester, or anything like that to test for power? In the meantime, make sure AC is in off mode, then go to breaker panel & push breakers for microwave & AC, all the way off hard, then try to reset it & tell me what happens.

Sep 04, 2009 | Coleman Heating & Cooling

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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

Jun 12, 2008 | Heating & Cooling

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

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2 Answers

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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.

Jun 11, 2008 | Heating & Cooling

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