4 Common Coleman Mach RV Air Conditioner Problems (Troubleshooting)

coleman mach rv air conditioner troubleshooting
coleman mach rv air conditioner troubleshooting

RVs are capturing everyone’s attention like never before. They have become increasingly popular among travelers over the past few years, and now more and more travelers are investing in these recreational vans. They hit the nail on the head by giving you the freedom of driving and exploring nature while saving you tons of money.

With that out of the way, an air conditioner is one of the most important appliances in an RV. It’s no secret that most people like to travel in the summers, and if you are one of them, you would know the importance of air conditioners. They cool down your RV while offering a few other benefits as well.

Based in Chicago, Coleman is a well-known brand that mainly focuses on manufacturing outdoor products. The products are designed to be installed in motorhomes and recreational vehicles. The equipment includes tents, camping gear, air conditioners, and electronic devices. They are manufactured meticulously with travel in mind and are pretty easy to install as well.

This makes Coleman one of the best companies for camping-related products. The reviews from users have also been mostly positive. Though, there are still some errors that you can encounter while using the Coleman Mach RV air conditioner.

Today, we will be using this article to list a few troubleshooting steps for the Coleman Mach RV Air Conditioner. This would help you fix the most common problems that you are likely to face while using the Coleman Mach air conditioner.

Coleman Mach RV Air Conditioner Troubleshooting

Here are some of the most common Coleman Mach RV air conditioner problems and effective workarounds.

1. Check the Thermostat

Check the Thermostat

If you notice that the air conditioner unit is blowing hot air, the first thing that you should be doing is checking the thermostat of your Coleman Mach RV air conditioner. This is usually used to control the temperature of air that your unit will be blowing out.

You can alter it, and then it is set to any value that you want. The main reason people have a problem with the thermostat is that they select a higher temperature than the current room temperature .

To get your air conditioner to work optimally, the user will have to set the value to something much lower than the current room temperature. The process is relatively easy, and you should not have much trouble with it.

If you are still confused, try lowering the temperature to its lowest value. You can then increase it slightly to find an optimal temperature. To change the temperature of your air conditioner, get its remote and increase or decrease its temperature as per your liking.

2. Clean Air Conditioner

If you are still getting warm air or the pressure is too low, the vents on your unit might be blocked by dirt. No matter how clean your motorhome is, dust and debris from your surroundings can always accumulate on the vents of your Coleman Mach RV air conditioner.

The air conditioners from Coleman have filters on them to block all the dirt. Though the dust particles will start to get clogged up over time, you will notice that the vents will also get covered with dust particles.

This is exactly why the air conditioners need regular cleaning. For best results, they should be cleaned every week. The process is quite easy, and you should not have much trouble with it.

Start by opening up the unit from its front. There is a small plastic lid that should quickly come off without much force. Make sure not to apply too much pressure because the lid can break easily.

You will now notice the dust in your vents and filter. The white filter can be taken off and then cleaned. As for the vents, you can clean them off with a wet cloth. While these can also be removed, there is no need to do so. After thoroughly cleaning off the filters, reinstall them carefully.

Cleaning your Coleman Mach RV air conditioner is likely to fix the problem. If it doesn’t, there could be something wrong with your air conditioner’s wiring.

3. Check Circuit Breaker and Wiring

Check Circuit Breaker and Wiring

Sometimes, the air conditioner unit can stop functioning altogether. This usually indicates that your device is not receiving current from the outlet. Before checking your connections, make sure that you take proper precautions. Electrical wiring can be dangerous to mess with if you are not familiar with the process.

It is recommended to seek help from a trained professional if you are unsure about it. Handling the repair on your own involves risk. The professional will effectively diagnose the problem and fix it for you.

However, if you have enough knowledge and want to undertake it on your own, then check the main circuit breaker. The connection is then cut off to save your appliance from getting damaged.

Furthermore, check to see if the fuse of your circuit breaker is intact. Sometimes, they can burn out and stop the Coleman Mach RV air conditioner from functioning properly. The problem won’t be fixed until you replace it.

You can take out your current fuse and check the current value on it. Afterward, head to your nearby hardware store and purchase a similar fuse. Since Coleman Mach RV air conditioners are widely used in RVs, you’d be able to find them easily in your nearby hardware store. Once you find it, hire an electrician to install it in the circuit breaker.

Finally, switch on the connection back up to proceed to fuse your air conditioner. The wirings can be checked through a voltmeter to ensure the value of power coming from the outlet. Try changing your outlets to see if there are any issues with them.

4. Leaky Air Conditioner

Leaky Air Conditioner

Another common problem that you may face while using the Coleman Mach RV air conditioner is that it sometimes starts leaking. Mostly, it happens when it is raining outside, but it is important to mention that it can leak even if the weather is clear.

This problem is quite concerning for a user since it causes not only damage to the Coleman Mach RV air conditioner but also to other items that come in contact with water.

First, check to see if the bolts are loose. Sometimes, the screws and bolts go loose over time, causing water leakage. If that’s the case, simply tighten the bolts using a screwdriver, and it will resolve the issue.

If bolts are already tight, the problem may be with the gasket of your air conditioner. The gasket is your main line of defense against water sneaking in . However, it can also get damaged due to many reasons. As the RV ages, so does its air conditioner’s gasket, and you may need to replace it if it is not in a good working condition.

Consider buying a one-piece gasket since these gaskets tend to be more durable than glued ones. If the gasket is glued or has mitered joints, it can cause the gasket to fail or leak.

Before replacing, you will need to confirm that the gasket is the culprit. For this purpose, inspect the area around the interior of your Coleman Mach RV air conditioner to see if there is any dampness. If yes, it’s time to replace the gasket of your Coleman Mach RV air conditioner.

First, make sure that the power is disconnected from the AC unit. Most models have a channel in the heat pump where the gasket sits. However, if your model doesn’t have it, consider marking along the outside edge of the existing gasket before removing it. Now, take off the old worn-out gasket.

Before installing the new gasket, make sure that the mounting surface is clean and dry. Remove the adhesive backing on your new gasket and adhere it to the right place. If there are no channels inside the heat pump, see the marks you made earlier to know the exact location of the gasket. Now, press it firmly to make sure it stays in place.

6 thoughts on “4 Common Coleman Mach RV Air Conditioner Problems (Troubleshooting)”

  1. In June 2021 my 2014 Winnebago Trend A/C went out so I purchased a new Coleman Mach Mach 3 +AC unit. It is model number 48203-666 which is supposed to be a 13,500 btu unit which is the same btu capacity of the unit it replaced.

    And just for reference the Winnebago Trend is a small c class RV, about 23′ long. Even though it is advertised as sleeping 6, it is just me and my 3 small Jack Russell terriers.

    The first dog trial I went to with the new A/C was in July in North Carolina. The temperature inside the RV got to over 95 degrees. I had a mobile guy install the unit and he said to take it to a Coleman Mach authorized service center for a warranty claim. I took it to Great Escape RV Rental, they were nice folks, look at my RV and told me the unit was functioning as specified, so no warranty replacement required. I had them replace the inside unit just in case it was a control problem. They also told me to put insulation over all of the windows.

    The next two dog trials were in October in Gainesville Georgia and Williston Florida. It got up to 95 degrees inside my RV with it running continously on high cool from 7 am to 10 pm. The only way I could survive it with the dogs was to run the truck air conditioner for two hours from 4 pm to 6 pm. I had added two layers of rigid insulation to all of the windows. I am telling you, the capacity of the new air conditioner from Coleman Mach is not 13,500 btus as specified and the unit I have is some kind of lemon. I have gone back to Great Escape and to Coleman Mach to try to get some kind of satisfactory resolution to my problem. So far nothing.

    It is sad, because I have purchased Coleman products in the past and was very satisfied.

    When I am out in my RV, and something as important as the A/C is not working, it is a complete nightmare. I do not know if the lemon AC Coleman Mach unit is the result of a Covid disruption, and as inconvenient as it has been, if they would just replace my unit with one that actually works, I would be happy. But so far, nothing.

    As things stand, I would not recommend this unit.

  2. I have a 13,500 Coleman Mach on 22’ ice cream trailer. You can’t stand it on a hot day, only blows 76 degree air.

  3. So my roof mounted AC was dripping water on the inside I got the top of the unit on the roof cleaned out and two days later it started leaking again not sure what the heck to do now

    • I am experiencing the same problem. I was told that it from condensation due to lower temperatures and higher humidity levels.


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