Question about Coleman Mach III Air Conditioner

1 Answer

Compressor wont start

My bus has a rarely used older unit that ran perfectly until last week. I noticed that during the cycle to start the compressor, it slowed down for about 10 seconds, compressor does not start, then fan resumes normal speed for a couple of minutes. it then lugs down again (fan also) for the 10 seconds or thereabouts, thens resumes normal fan operation for a couple of minutes or so. Its like it cycles for the compressor and when it doesn't start, it waits a certain period then does it all again. I was working in the bus when it did it and noticed it immediately.It worked so normally I have a hard time thinking its the compressor.

Posted by on

  • stproman Jun 23, 2008

    That makes sense. The unit ran perfectly until the evening it started cycling repeatedly. Its an older unit that was on an older bus conversion I am restoring, and had very little use, which can be bad. I tried it the next morning and it was exactly the same. I will pull the cover and check the compressor for grounding and go from there. If I have any further questions I will go for the premium assistance. I appreciate you. LS



1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert whose answer gotĀ voted for 20 times.


    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 104 Answers

It is probably a failed run capacitor for the compressor. Without the capacitor, the motor can't even try to run, but it will draw extreamly high amperage until it trips the thermal overload (avarage trip time 5-10sec) after it has a few second for the safety to cool off, it will try again. Either that or the compressor truly is seized

Posted on Jun 23, 2008


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.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

I am wondering if that is just going to continue and need to replace entire washer?

Unless the machine is over 25 years old or is being used more frequently than once a day I would maintain the machine doing as many repairs as possible myself or if available have a reasonable repair service I would still consider maintaining the machine. I'm amazed at the reliability of the older units.

Many of the repair parts have had the corrections made to prevent them from failing for the same reason. This will increase the reliability of the older machines. Also in general the older units are less complex (less things to fail) and easier to repair. You should expect that a newer machine, using significantly more complexity, uses less water and electricity to achieve the same cleaning performance as an older machine.

The control electronics have an indefinite life meaning they fail for components on the board not because they wear out or get old. The likelihood of a new/replacement board failing is consistent with the likely hood of a brand new machine failing. As the control boards age they are less likely to fail.

Using u-tube and fixya and other sources of repair knowledge the older machines have a wealth of experience to bring to solving the problem The newest technology machines will have to go through the learning curve.

The question is will a new machine perform the job significantly better than the unit you have.


Dec 30, 2015 | Washing Machines

1 Answer

2004 Jeep Grand Cherokee temp gauge high when heat is on

If your "check engine" light is turn on, I suggest scanned the PCM to know exactly what fault code is stored there. Additionally, could be some problem with the "temp sending unit".

Keep us updated.

Jan 23, 2012 | 2004 Jeep Grand Cherokee

1 Answer

Battery life poor

Check for cable corosion, and any bad ground or power on.

Dec 17, 2017 | Polar CS100

2 Answers

Compressor kicks out and it's new

First of all, clean your outside coils so that you are assured of good cooling air. The compressors have an overtemp device that is usually internal to protect them against heat. If you have an air compressor use it to blow out the coils good. If the compressor will start, the capacitor is good so it sounds like a cooling problem with the compressor

Jun 25, 2009 | Ruud UAMB Air Conditioner

1 Answer

Metallic bell thud when unit turns off, kenmore refrigerator

Hi, It is the compressor. The compressor is a pump inside the housing you see under the refrigerator. The pump sits on some springs inside this housing and one of the springs has gone bad. When the compressor shuts off, there is back pressure and the noise you hear is the pump hitting the housing because that sprig is broke. There is no fix other then replacing the compressor. It is very costly to replace. If this refrigerator is older, I would recommend you start looking for a new refrigerator. The noise could last a while but, it is a sign the refrigerator will not last much longer.
I hope this helps you understand what is happening.


Jun 21, 2009 | Refrigerators

1 Answer

Older t 30 won't start

I believe your capacitor or capacitors are going out. Or one of the three phases has popped a fuse.

If there is a fuse box for the unit, shut off the breakers on the wall to the unit and do a continuity test across each fuse.

If nothing is found, remove all motor capacitors and bring them into you local electric motor repair shop. Usually they will check capacitors for free.

This should do it.

Mar 31, 2009 | Ingersoll Rand Type 30 Reciprocating Air...

1 Answer

Whirlpool dryer won't heat

Ended up replacing the solenoids and the burner ignited, flame stayed on. Problem appears to be solved. Thanks for your help and posting.

Jan 03, 2009 | Whirlpool LGR7646E Dryer

1 Answer

Freezer Coils Continued To Freeze Up.....

It could be the defrosting clock usually positioned at front bottom behind the removable grill or in the back. This clock times the running and defrosting time, so if stuck on run it will never go to defrost cycle and the ice piles up.It has a one way slotted fit. Use a wide flat screwdriver to slowly turn the dial until compressor stops, (defrost cycle) this will not only stop compressor, but also turn on that tube heather you where talking about to melt ice off evaporator. Then wait (up to 30 minutes) to see if starts up again(run cycle). If it does not, clock needs replacement. You can then turn clock again slowly to turn compressor back on so you can use fridge until repaired. You can do this off and on daily to manually defrost unit until repaired. If this is not your problem it could very well be the heather tube, but they rarely go out.
Best I can do without being there, hope it helps you.

Dec 14, 2007 | GE (PSS26MSRSS) Side by Side Refrigerator

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

425 people viewed this question

Ask a Question

Usually answered in minutes!

Top Coleman Heating & Cooling Experts

Bill Long

Level 3 Expert

588 Answers

Paul Carew

Level 3 Expert

3238 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