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Old 02-25-2021, 04:28 PM   #1
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Coleman Mach 8 ac air conditioner repair vs replace

Toward the end of last summer, my Coleman Mach 8 quit cooling. We live in our 2017 North Point and will want the ac to work well this summer. I hate the idea of replacing the unit if it's repairable and am looking for tips.

We arrived at the camper one afternoon with the outside temperature near 75 degrees. The thermostat was set on 65. We heard a bumping sound from the ac unit. We could kinda feel the camper jerk or bump a little bit when the sound occurred. Felt to me like the compressor might be messing up but I don't know. Does anyone have experience with these units? I have questions:

1. The unit hardly turned off during the past 2 summers. It ran nearly 24/7. Should I just replace it?

2. Coleman Mach 8 vs Mach one better than the other?

3. Any experience that would let someone believe this could just be a circuit board or a relay or something?

4. After speaking with Coleman, I found my compressor is a Tecumseh brand and they have gone with a different brand on the new units. The customer service guy at Coleman was amazingly helpful. He believes if the compressor is out, I am better off replacing the unit. How do I know if the compressor is out or if it's something else?

5. My local dealer sells a Mach 10 for $1245. Total, including labor and tax is $1560. Any tips where to find one for less? I believe I can install it myself.

Just looking for help before I drop $1500.

Any input or experience is appreciated.
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Old 02-25-2021, 04:40 PM   #2
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Amazon has the Coleman Mach 10 for $945 with free shipping. The Mach 15 is even less.
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Old 02-25-2021, 04:41 PM   #3
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A lot of times the problem is with the run\start capacitor, you could simply replace it if you are comfortable doing so, about $25 but you have to lookup which one you need for your model A/C. In any case, I wouldn't rush out to purchase a new A/C without knowing what is wrong with the one I already have, certainly could be an easy repair such as if it was the capacitor. Could be other issues of course, but capacitors are known to fail in A/C's and will keep the compressor from running when they do fail.
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Old 02-25-2021, 05:13 PM   #4
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I saw the same thing you did on Amazon but Coleman tells me I need a Mach 10 #45204-679 or Mach 8 #47204B879. They say other units might not be compatible with the thermostat or the mounting hardware. I found one of those for $942 + $189 shipping at but would sure like to beat that if I can.

I've now spoken with 3 dealers. None of them wants to diagnose the unit to see if a capacitor or switch or circuit board is bad. They all refuse. They tell me all they will do is replace the unit. Frustrating!!
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Old 02-25-2021, 05:27 PM   #5
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You have to remember that the MACH 8 is the LOW PROFILE so you have to watch your clearance.. As to getting it repaired call a Mobile Tech and have him call COLEMAN if he has questions while diagnosing.
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Old 02-26-2021, 11:40 AM   #6
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I checked the height. I'm okay if I go with a Mach 10 instead of the Mach 8. I called a mobile tech but he isn't licensed for freon. I'm in southeast Kansas and am not finding many options. UGH! I'm certain the small supply of Mach units in warehouses will soon be purchased as spring approaches so likely I'm going to bite the bullet and buy a Mach 10 from somewhere online and install it myself. I have a forklift and can easily lift the unit to the roof. If I decided to pursue this route, I'll make a new thread with pics to show any obstacles I encounter and tips I discover during the install. Thanks for the input. Matt
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Old 02-26-2021, 02:06 PM   #7
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You might want to check the fan inside the unit. It’s not hard to remove the cover. I have replaced these on both my AC’s as they are plastic and fall apart quite easily and make all kinds of noise when they break.

When these break it sounds like the whole AC is falling apart.

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Old 02-26-2021, 07:10 PM   #8
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I also replaced the squirrel cage fan on the mach 8 after a couple of the blades on the fan broke off. Easy to do
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