Air Conditioner Motor Causing My RV To Vibrate

Air Conditioner Motor Causes My RV To Vibrate
Air Conditioner Motor Causes My RV To Vibrate

RV Air Conditioner Motor Vibrating

It’s not unusual for either the air conditioner or the onboard generator to cause an RV to vibrate. Think about it; your RV is not firmly anchored to the ground like a house, and it’s made out of lighter material. Likewise, it’s built to withstand the vibrations of the road, by having a degree of built-in flexibility. With that said, let’s look at a few reasons why your air conditioner may cause unusual vibration.

The Screws Bolting It To The Roof Could Be Loose

You’ll need to go up on the roof and take the cover off, and then tighten all of the screws and bolts on the air conditioner to make sure they are not loose.

The Motor Shaft Could Be Bent

This is not an uncommon problem with some Dometic models. If the motor shaft is bent, it will need to be replaced.

The Blades On The Motor Fan Could Be Unbalanced

This is an unusual problem, but check to make sure there is no debris on any of the blades, and that all of the blades are straight and unbent. Likewise, make sure the fan unit is not loose.

A Freon Line Cable Clamp Could Be Loose

The freon lines can vibrate quite a bit, and if it rubs through the rubber cable clamp causing the metal to metal contact between the freon line and the clamp. If this is the problem, you’ll need to replace the clamp or wedge a piece of rubber between the copper freon line and the clamp.

Clogged Coil Fins

If the coil fins are clogged with dirt and debris, the air conditioner can get noisy. If the fins need to be cleaned, use a brush attachment on your vacuum to clean off any dirt or debris.

Bent Coil Fins

Bent coil fins can also cause the air conditioner to hum and vibrate. You can straighten out bent fin coils with a special tool called a fin comb. Place the teeth of the fin comb in between the coil fins and gently slide the tool up to straighten out the bent fins.

Maintaining Your RV Air Conditioner

Yearly air conditioner maintenance is advisable. In order to guarantee the maximum efficiency of the air conditioner on your motorhome or trailer, cleaning the evaporator and the condenser, every year will make a big difference in the performance of your RV air conditioner. In fact, lubricating the fan motor will help to extend the life of your RV A/C.

These tasks are easier than you might think and will save you money in the long run, as well as keeping noise and vibration to a minimum.


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