Question about Dometic Rooftop RV Air Conditioner

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AC unit on Viking popup is loud and vibrating

Works great but the vibration shakes the whole camper and the noise is so loud. We used the camper for the first time in a year and this happened immediately on firing it up.

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Take the cover off the front of unit and look down inside at the blower wheel see if there is something in it

Posted on Jan 22, 2009

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DId you take the top off and look for a mud-dauber or wasp nest on the fan? I've found them on ours ...

Posted on Oct 14, 2013

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1 Answer

Outdoor unit on of my 1.5 ton AC making a lot of noise in running condition I have checked the outdoor unit of any body screw lose or of fan baring or bush, but i think it from the compressor side and also...


If this is an old unit is is possible that the compressor is vibrating with the load. check and see if the mounting bushes and the foundation is tight and clamped properly. If not the unit must be removed and plugged well into a good foundation. Also check the mounting bushes of the compressor , If this wont solve there is fault within the compressor , possible low lubrication that make it vibrate which might require a consensus and estimate.-- specially if the cooling is going down.

Aug 22, 2011 | LG Air Conditioners

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Whynter Portable Air Conditioner Model: ARC-14S. Problem: It sounded as if something fell inside the unit while it was operating (cooling) then it started to vibrate horribly. The vibration is only...


Hi,Whynter Portable Air Conditioner has many moving parts, and they all make noise and cause vibrations. Some of these parts are more likely to causing shaking and loud noises, and sometimes this signals a larger problem, something to watch and scrutinize. If serious enough, it calls for a repair.

Loose Parts

Loose parts cause the majority of shaking and vibration noises in your air conditioner. A few of the most common loose parts include the air compressor, the piston rods and even the fan or blower unit itself. These noises are clunking, clanking sounds that occur along with a vibrating action. The only method of repair is a complete compressor replacement, which is a repair only a certified air conditioner technician is qualified to make. The compressor is a fully sealed component, so individual parts in the compressor cannot be repaired.

Fan Blades

Fan blades cause noise, shaking and vibrations even when properly secured. If fan blades contact the exterior structure of the air conditioner due to a bent fan blade or broken and misaligned grate, a constant, repetitive noise and vibration results, which sounds like a ticking or banging from the interior of the air conditioner. Vibration in this case is limited but still present.

Mounting Brackets

When an air conditioner shakes, there is a problem with the mounting brackets. These brackets hold the air conditioner compressor steady as it operates. Normal vibrations and shaking would otherwise occur without these brackets. A loose mounting bracket causes the air conditioner to rock back and forth and creates a clanking sound. As the compressor starts up, this rocking and clanking sound begins, resulting in a very loud and fast vibration and noise. It also occurs when the unit shuts down.

Other Sounds and Vibrations

Sometimes air conditioners squeal, hiss, hum or screech. Each noise is often accompanied by a vibration. Humming sounds along with a vibration may indicate a bad capacitor, the electrical part responsible for starting the machine. Hissing sounds tend to indicate a pressure problem while screeching and squealing sounds are fairly common in window air conditioners and in central air conditioners. This sound is also a result of the compressor motor. It usually starts when the unit turns on and continues through its normal operating cycle. Vibrations always occur in the air conditioner due to moving parts and the compressor motor's operation.


Hope it helped..

Aug 18, 2011 | Whynter Portable Air Conditioner

1 Answer

My unit outside is working fine but it is making a lot of noise. All my neighbors are telling me that this is not normal. What can I do to reduce the noise. It is spinning fine but it makes loud noise.


Is the condenser coils clean..... If not take a hose and wash the condenser coils But make sure you shut the Main power off to it. Has the unit been charged with Freon lately??? If so they may have gotten it overcharged which will cause High head pressure and make the compressor noisy..... Or is it out of level and not setting on a stable surface. causing a vibration noise. You can put rubber pads under the AC if it is a vibration noise...... Also the Compressor may be going out..... It is hard to tell with out hearing it first hand....Hope this helps If you can't get it to quite down I would setup a Service Call to have them Service the AC and that you are having a loud noise coming from the unit....

May 05, 2011 | Goodman CLT48AER48 Air Conditioner

1 Answer

Was given a roof top ac for a popup camper need help


Make and model of unit should be on base of roof assy, please reply with that so we can be sure we have right wiring info for you. Although they are pretty common, let's be sure.

Jul 30, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

My ac is extremely loud and vibrates the entire house. Is it supposed to do this. I have 4 other acs in my house and none of them do this. Sometimes the fan blows and that's fine but then it charges and...


This will need to have the compressor mounts checked...If fan only operation is smooth...and only happens when compressor is on, is a direct sign of vibration off compressor. Check the rubber foot mounts under compressor.....of course this requires removal and cover taken off

May 10, 2010 | LG LW7000R Air Conditioner

1 Answer

My AC is extremely loud and vibrates the entire house. Is it supposed to do this. I have 4 other ACs in my house and none of them do this. Sometimes the fan blows and that's fine but then it charges and...


no its not suppose to do this,the pump has a broken spring in side it which creates the viberation,unfortunatly the pump is a sealed unit so it can not be repaired.you have to replace the pump,cashie,probably be cheaper depending on age of unit to buy another a c unit.

May 02, 2010 | LG LW7000R Air Conditioner

1 Answer

After compressor on,Sears/Kenmore ac makes a loud vibration noise


sounds like head pressure problem it is most likely clogged on condenser try washing out really good then try again

Sep 10, 2009 | Air Conditioners

1 Answer

I have a 13,500 btu coleman on our 1989 avion camper. It was making a very loud noise for some time, and vibrating then the motor locked up on it. My husband thinks the blower went out on it. It was...


You should be able to turn the fan motor freely by hand. If there is any resistance or the noise turning it by hand, then the fan motor is definitely bad. Is it a wall thermostat unit or manual controls? Wall thermostat, you can use a jumper wire from the 12+ terminal of the thermostat to the HG terminal and the fan should come on, if not, then the motor is bad.

Jun 24, 2009 | Coleman Mach III Air Conditioner

1 Answer

Haier ESA 3185 AC won't cool; makes escalating loud vibrating noise near front panel/ filter


Have someone check the run capacitor of this unit. If the run capacitor is bad over shorted it can cause the unit to run and short cycle on a current overdraw. This makes for an electrical imbalance in the compressor motor. Next step is the compressor is faulty.

May 16, 2008 | Haier ESA3245 Thru-Wall/Window Air...

4 Answers

Loud as Hell


Is it installed in a window? Check to make sure it is installed correctly. usually there is a felt or foam strip that is used to dampen vibration when you place it in the window. It also acts as seal to keep outside air and bugs out. If you place your hand at various locations on the unit does the sound go away? If it does then you know it is a vibration problem. Just add new foam or re-adjust the foam or gasketing it already has. If that doesn't work then try to locate the source of the noise. Use a mechanics stethoscope or even a cardboard tube from paper towels will work. Once you have located the source then you can tell the store what the problem is when you take it back and get a new one. Cheap air conditioners are noisy. Some more than others, it's why they are cheap. But your problem does sound like it could be a product issue.

Sep 25, 2007 | Haier Mechanical Air Conditioner HWF05XC7

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