Coleman Mach AC Making Loud Noise – Why And What To Do?

As a homeowner, you may have noticed that your Coleman Mach AC is making loud noise but are unsure of the cause and how it can be fixed. Luckily, we have done some research for you, and here is what we found.

Problems like dirty condenser, loose screws, faulty fan motor bearing, refrigerant and compressor valve leak, loss of charge, electrical issues, and bad thermostat are possible reasons your Coleman Mach AC is making a loud noise.

Here are things you can do to fix the problem:

  • Clean your AC unit.
  • Check for loose fan blades.
  • Replace the compressor.
  • Tighten loose screws.
  • Contact HVAC Experts

AC makes various types of sounds which could mean different things. A loud and disturbing noise from your Coleman Mach AC unit can indicate a moderate to a serious problem.

Keep reading to get detailed information on how to fix an AC that makes a loud noise.

photo of a two aircon exhaust outside the house on the garden on the backyard, Coleman Mach AC Making Loud Noise - Why And What To Do?

Why Is My Coleman Mach AC Making Loud Noise?

Coleman Mach AC noises are a sign of something wrong with your unit, and the problem should be dealt with as soon as possible. 

If you notice an AC noise from your Coleman Mach AC that sounds like intense banging, it is most likely a condenser problem. However, it is not always the case.

photo of an aircon condition exhaust on the top of the house on a hot day

Here are possible reasons why an AC makes loud noise:

Dirty Condenser

An air conditioner's banging or rattling noise is not always a result of a serious issue and can be readily fixed. This noise may occasionally come from the condenser when sticks, leaves, or other dirt particles get stuck in it. 

Small leaves and twigs accumulate in your condenser if you fail to clean it for a long time, especially if bushes surround your outdoor unit.

Loose Screws

Loose screws cause some rattling sounds. An air conditioner's inner and outside units vibrate when turned on. This vibration may cause the screws to loosen over time and, as a result, develop a loud noise.

Bad Fan Motor Bearings

When you switch on your Coleman Mach air conditioner, a metal-on-metal screeching sound could indicate that the fan motor bearings need to be replaced.

Broken Blower Fan

photo of three aircon aligned on top of a house roof roof top

A broken blower fan motor might potentially produce a screeching sound. The blower fan is designed to draw warm air from all the rooms in your house. It also disperses the cooled air from your system throughout your home.

When the blower fan is faulty, it may produce a screeching sound.

Refrigerant Leak

A refrigerant leak is one of the causes of AC hissing noise. Damage to the refrigerant line may be the cause of leaking refrigerant. The lines may weaken over time, leading to leakage. 

Compressor Valve Leak

A compressor valve leak may also cause hissing sounds. The pressurization of the refrigerant is managed by the valves. So, any valve leakage within your unit will produce a hissing sound.

Air conditioning compressor problems are frequently obvious. If your compressor is malfunctioning, you may notice signs like difficulty starting your AC unit, system blowing warm air, circuit breaker issues, and reduced airflow.


If your outside unit is making clicking noises, one of the fans probably has an obstruction that needs to be cleared. Simply perform your regular maintenance, or remove the cover from the outside unit to clean your fans.

Loss Of Charge

The capacitor's potential for losing charge over time is another problem. If this occurs, the capacitor cannot power the compressor, and the clicking sound you hear is the unsuccessful attempt of the outdoor unit to switch on.

Faulty Thermostat

Incorrect electrical impulses in your AC unit can result in the switches constantly clicking as they turn on and off. Also, your appliance may make a loud clicking sound due to a broken thermostat.

You may hear a quiet clicking sound when a thermostat is functioning normally; this is the sound of a relay switch turning on the AC. 

However, the relay will continue to deliver electricity, and you will hear loud noises if the relay is damaged or has a wiring problem. But it won't be able to turn on the system.

What To Do If My Coleman Mach AC Makes Loud Noise?

photo of an aircon exhaust on the outside of the window on the house

If you notice that your Coleman Mach AC is making loud noises, here are some things you can do to fix the problem:

Clean Your AC Unit

Simply unscrew the unit's screws and nuts. Check for stuck debris, such as twigs, dust, stones, or other particles that may have clogged your unit. Make sure to remove them if you find any.

Check For Loose Fan Blades

If your AC makes loud noises, you can remove the unit's cover after turning off the air conditioner. Then look to see whether any of the fan blades are positioned oddly.

If you discover they are, do not attempt to fix it yourself. It's recommended to call an air conditioning professional to take care of the issue.

Replace The Compressor

When a compressor starts going bad, it tends to generate a lot of noise than usual. If you notice this problem, you don't need to change the compressor since they can last long after they start generating noise.

But if you want to replace yours, it is better to have a professional do it for you.

Tighten Loose Screws

If your system starts making a loud noise, then some of its screws might have loosened. Examine all the screws and tighten any that are loose.

Contact HVAC Experts

Most of the time, it's best and safest to let a qualified air conditioning specialist or a reputable air conditioning servicing company handle the repairs for you. 

How Much Does It Cost To Repair Coleman Mach AC That Makes Loud Noise?

photo of an aircon exhaust on the outside of the house on the backyard

The cost to repair your Coleman Mach Ac noise issue will vary depending on how bad the issue is.

However, repairing an air conditioner in your house can cost between $200 and $600. Minor causes like clogs are inexpensive to deal with. You can even solve the problem by yourself.

However, expensive repairs may be necessary if a specialist is required to address problems with the compressor or coils. These might cost more than $2,000. The life span of your Coleman Mach AC compressor depends on many factors. Coleman Mach AC compressor should last 12-15 years.

The compressor should last as long as your air conditioner, which should be at least twelve years.

However, if your air conditioner is not big enough for the room, it's cooling, or if you don't keep it well-maintained, it may not last as long.

What Is The Normal Coleman Mach AC Noise?

The normal noise for a Coleman Mach AC should be low when blowing cool air through your home's ducts and vents. This noise should be quiet and not too noticeable in the background.

What Does A Dying Coleman Mach AC Compressor Sound Like?

Unusual noises from your Coleman Mach air conditioner are typically a clue that something is wrong.

 The Coleman Mach AC unit typically makes a humming sound while it's operating, but if the sound suddenly changes to a ticking or rattling sound, it means the compressor is dying, and it is having trouble turning on and off.

You should contact an HVAC expert to inspect your unit.

What Does An Overcharged Coleman Mach AC Compressor Sound Like?

An overcharged Coleman Mach AC compressor makes a lot of noise as it struggles to force liquid coolant through a tiny nozzle made for gas molecules.

This doesn't always occur because certain AC compressors have a bypass to stop excessive internal pressure from stressing the pump.

An overcharged Coleman Mach AC compressor sounds somewhat similar to a failing power steering pump.

To Wrap Up

photo of a two aircon exhaust outside the house on the garden on the backyard

Maintaining your air conditioner and having it checked regularly can prevent your air conditioner from making loud noises.

If you notice that your Coleman Mach AC is making a loud noise, all you need to do is clean your AC unit, check for loose blades, and replace your compressor.

Contact a professional if you can't solve the problem by yourself.

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