Question about Dometic Rooftop RV Air Conditioner

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What causes the air conditoner to vibrate? will run okay for up to an hour, then starts vibrating on high setting. On low setting it's not as bad, but if you feel the coach side, you can feel a vibration. after several hours it makes the same vibrating noise that it does on high. turing it off for a few minutes, seems to make it go away for a while.

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Take the covers off and look for dirt dobers nest, they are made of mud like stuf. spray some water threw a squart bottle use needle nose and a screw driver to bust them. this hapend to my home and motor home.... bill
ps might be some other debree in the fan.. take a look you will be suprised how easy it can be.

Posted on Jun 30, 2009

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Check fan may be going out or loose.

Posted on Jun 30, 2009

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Never trust anything that comes to you new because usually they are made in china and are not consistent, but next time make sure clean air is being supplied if impeller gets dirt build it becomes imbalanced and will draw high amps and create that vibration noise. Also vibration noise can be caused by improper combustion set up.

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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..

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1 Answer

I have a 2.4 vtec with 5spd, when I accelerate I get a serious vibration. I've checked the mounts and replaced the right side axle to no avail.


IF your front end is jacked and your front tires are spinning you should be able to see the vibrations. Use a stethoscope on your motor and tranny to isolate vibrations while running.

In your case id start with wheel balancing first. Have them balanced on the car too (ofcourse). Having it only at a specific speed indicates its a harmonic vibration (vibrations that only occur when something rotating,reaches given speeds)
So yeah, start with cheapest repairs and go from there.

I highly doubt its your mounts unless they arn't sitting or torqued properly. If your confident they were installed perfectly i'd ignore that possibility.

Also, with front end jacked and car not running wiggle your wheels left/right, and up/down to see if any play. Spin them and look at them from the front to see if they wobble.

other causes are, tire with a bad tread, one thats about to separate, this is what caused my car to vibrate
deeper causes can include a bad flywheel,, broken or bad motor mount, and a simple alignment

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COULD HAVE LOW AND HIGH SPOTS IN THE BRAKE ROTORS.CHECK TIRES FOR DEFECTS.COULD NEED FRONT END ALIGNMENT OR BAD WHEEL BEARINGS CAUSE WHEELS VIBRATION.

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There is an excessive vibration during idle. it disappear when i stepped on the accelerator and increase the rpm to 750rpm. im bit worried of it as it cause my dash to rattle too much.


check air filter. may be very dirty or you may have a nest inside of the box causing low air flow into the engine, causing vibration. start there. i have seen cars towed in not running, because they/mice/chipmunk?? had huge nest made out of the carpet underlayment in the air box which is foam and it didnt give the engine enough air to even run , because it was starving for air and car needs air to run. Is the check engine light on?? while engine is running??

Jan 02, 2011 | 2006 Nissan Frontier

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Engine vibrates when idiling in drive only does not vibrate in park or neutral or reverse has new motor supports (all) recent tuneup cant determine cause (the motor runs so smooth except while idiling then...


Check your throttle body gasket, if it's leaking unmetered air it will idle high, this coupled with a bad ignition coil, plugs not properly gapped or old/worn as well as old/worn spark plug wires will cause a misfire that may not trip the CEL light. Also check your idle air control valve to ensure it's working and clean on the inside of the throttle body.

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try pressing around the unit with your hand while unit is running, the sheet metal may be loose or vibrating against something wedge it something and check for loose screws.

Jul 22, 2009 | Heating & Cooling

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Vibration when ideling


the engine may not be running right on all four cylinders causing the engine to shake after the automatic choke drops. take out one spark plug at a time leaving h.t lead on get someone to turn it over whilst you check the strength of each spark being carefull not to touch the plug as this will give you a very nasty shock [I KNOW]

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