Question about Coleman Mach III Air Conditioner

2 Answers

I have an old Coleman Mach 2 that has never failed me. Last weekend it worked just fine but then suddenly it quit cooling (the fan kept blowing). I turned it off thinking maybe it had frozen up or had overheated. I let it rest a good long while. When I turned it on, the fan came on but it sucked down the trailer's electicity as the compressor tried to kick on, but it didn't come on. A few seconds later, it tried to kick in again but couldn't. I then turned it off. Itried this several times over the weekend with no good results. I realize this is old and the problem could be anything. I am just wondering if the problem might be an easier fix such as one of the capacitors. My thinking is that the compressor might be ok still and the freon level also might be ok so it would be worth trying something like a new capacitor. If so, which one? Or am I just throwing money away???

Posted by on

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 10,515 Answers


To be really honest with you, it seems to be defective compressor. Whenever an Air conditioner shows the above mentioned traits such as not kicking on, intermittent working, More likely its a Faulty compressor.

Usually it happens if your Air Conditioner is more than 5 years old. In few cases, it might be earlier.You might get the AC worked sometimes, even if you tap the compressor.

I do not want to sound rude, But you are wasting your time b y trying to replace Capacitors.There are millions of connections. Which capacitor you would try?

You would waste your time and add frustration.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Posted on Jul 31, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Brigadier General:

    An expert that has over 10,000 points.

  • Master
  • 8,619 Answers


Thanks for using FixYa. Yes this issue can also be caused due to weak capacitors or a faulty relay. You'lll need to check these components. Please check these service manuals for Coleman Mach Series A/C--

Coleman Mach Series service manual

Coleman Mach rooftop Series service manual

Please do accept the solution if the issue is resolved or else revert for further assistance.


Posted on Jul 29, 2009

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Blower fan stopped working

Your fan may be overheating.
Here are a few things you can check yourself:
- make sure the air filter and the coils are clean
- check all electrical wire connections for tightness. Be sure to shut off the circuit breaker to the unit. Check all connections.
- look for anything out of the ordinary....burnt wires, burnt wire connections, overheated controls, etc.
After doing all these things, if you continue to experience problems, your fan motor could have bearings that are failing or the capacitor (if applicable) could be weak, or you might have a control problem.

I hope you find this information to be very helpful in your quest for truth. ;-) Let me know if you have any further questions.

Mar 16, 2010 | Coleman Mach III Air Conditioner

1 Answer

2 year old Coleman Mach III tapping and not blowing cold air:

Make sure the condensor fan is blowing through the condensor on the roof. It sounds like the compressor is fighting high head pressures after running a bit.. After so many attepts, or if it suceeds in operating the load trips the circuit breaker.. Make sure the condensor is clean and air is passes through it from the fan. Just for clarifiication the condensor is the coil that gets hot and the evaporator is the coil yat create the cold air. Good Luck, and if you will, let me know how it turns out. Good Luck. Ned

Sep 19, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

I have a Mach III. Unit blows hot air and bogs down when cooling.

probably (90 %) the compressor's bad, depnding on the repair cost you probbly want to just get another AC unit

Aug 30, 2009 | Coleman Mach III Air Conditioner

1 Answer

Constanly blowing fuses in thermostat

u have a short some place jumping the fuse wreck the transformer controls good luck Tom

Jul 07, 2009 | Heating & Cooling

1 Answer

One day my RV Coleman ac just quit running on low cool but every other setting works fine. Any ideas?

Is your Air Conditioner run with a wall mounted thermostat or the ceiling pack controls? If it is the ceiling pack controls, then your selector switch has gone bad and needs to be replaced. This is located in the ceiling pack itself and is relatively easy to do. You can easily test it with an Ohmmeter, going through these steps:

To check the selector switch, remove wires from the terminals
and rotate the switch to the proper position and read
continuity as follows:
Terminals Switch Position
L-1-3 Lo Heat
L-1 Lo Fan
L-2 Hi Fan
L-1-4 Lo Cool
L-2-4 Hi Cool
* If you do not wish to remove the wires from each terminal,
disconnect the 9 pin plug from the a/c unit.

Hope this helps,


Jun 27, 2009 | Coleman Mach 15 Air Conditioner

1 Answer

Coleman Mach 15 AC just quit. no compressor sound, no fan

If this is a ducted unit, check the thermostat. It has a fuse for protection that may have blown. If the fuse is fine and you have power to the upper units control box, check for 120V incoming power at the control box and also check for incoming 12V on the Yellow and GH wires when tstat is set to high cool.

Hope this helps.

Jun 26, 2009 | Coleman Mach 15 Air Conditioner

Not finding what you are looking for?
Coleman Mach III Air Conditioner Logo

Related Topics:

164 people viewed this question

Ask a Question

Usually answered in minutes!

Top Coleman Heating & Cooling Experts

Bill Long

Level 3 Expert

587 Answers


Level 3 Expert

2463 Answers

Dan Webster
Dan Webster

Level 3 Expert

8220 Answers

Are you a Coleman Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides