Question about 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 keep runing and cool down camper good that way do I have a bad thermostat or the wrong one part number on ac unit is 7330-730 part number on thermostat is ap7862

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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

Posted on Sep 07, 2010

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Posted on Jan 02, 2017

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I have 2002 ram 2500 gas. starts easy runs well then just dies. will restart in 2 to 5 min. new fuel pump, new gas filter, new plugs and wires, new thermostat (195), new air filter.


Check again piece by piece all that you just replaced to make sure one of then is not faulty from that house.
Check the oxygen sensors
The engine PCM
Catalytic convertor

Wish you luck

Dec 20, 2013 | 1999 Dodge Ram

1 Answer

Ac unit runs, inside blower shuts off after 2 mins, compressor continues to run, t-stat still calling for cool


My central AC unit decided to stop on the hottest day of the year. It would start and run normally for a few minutes and then the blower would shut off. After checking the breakers, thermostat and overflow shut off (did not have one) I saw something about a blower motor capacitor. This was easy to get to and replace and my last hope before waiting for someone to come fix it. The capacitor cost $4.04 with tax and had my AC working again. Needless to say I was beyond happy. I hope this can help others with a similar problem.

May 20, 2012 | Heating & Cooling

1 Answer

Furnace is 7 years old. Will not stay running for more than 5 min. Will start up again after shutting off and then run for another 5 min. Suggestions?


Check the air filter. Jump out thermostat to see if it stays running longer, if so replace thermostat. Make sure all return air ducts are clear of debris. If furnace has a Fan/Limit switch, make sure tabs are set at 100, 140 and 200. Sounds like something may be heating up and shutting unit off till it cools back down.

Jan 03, 2011 | Ruud Heating & Cooling

1 Answer

My colman rooftop ac unit shuts off after 5 min of use wait 5 more and you can turn it back on again when its running it works great its on a 1984 holiday rambler and has very low hours?


Try a new fan motor. It runs about $125.00, It will run a few min. then will trip the motor themal switch. you can probably still here the compressor running. It may also trip the breaker on shore power . good luck! the part you are looking for is a 1/3 hp 115vac 2 speed 1580/1020 rpm part number #1468-3069

Aug 25, 2010 | Coleman Mach III Air Conditioner

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Fan runs but no cool air. I don't think compressor is kicking in. Thermostat is working because when I adjust temp to be below or equal to air temp, AC unit turns on. When air temp drops as trailer cools...


Have you cleaned the unit? The condenser coil? The filter? The evapartor coil? Sounds like an airflow problem. You need to clean these areas. You can clean the condensor coil with water hose and a coil brush you can get at the hardware store. Clean the evaparator with the same brush. YOU can use a hairbrush if you don't have anything else. But make sure you go up and down on the fins on the coils not sideways. You might check your blower fan for dirt also. Good luck I hope I helped you. Could also be low on charge but first try cleaning.

Jun 28, 2010 | Heating & Cooling

1 Answer

My outside unit runs a little while then shuts off.


More likely the out door fan motor has bad bearings and that would cause the out door unit to run for 15 to 20 min but it could be low on freon
when the out door unit runs after 3 to 5 min the larger of the two copper lines going into the unit should be ice cold

If the thermostat you just installed has a time delay that will keep the indoor blower motor running for up to 5 min after the unit shuts off

Sep 01, 2009 | Honeywell Heating & Cooling

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I bought an older camper with a colman roof unit ac. My question is do I need to put small filters under the intake grates inside the camper below the ac cover. There is nothing in there. (bought it this...


its good to put them in, as it will keep dust from building up on the coils, thus reducing cooling.just buy some filter material at any hardware store, coarse, like a sponge, not fine paper stuff.

Jul 30, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

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


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.

Jul 01, 2009 | Coleman Heating & Cooling

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