Unlike camping decades ago, almost all RVs have at least one air conditioner.
Often they have two.
Besides cleaning awnings, resealing roofs, and checking RV batteries and water heaters, it’s very easy to forget that air conditioners need maintenance on a regular basis too.
Yes, air conditioners are mostly self-sufficient, but annually you should give them a good look to make sure all is well. Depending on where and when you travel, you’ll want—and need—your air conditioners operating at peak efficiency. After all, a winter spent boondocking in Quartzsite wouldn’t be a fun experience.
Outside maintenance on your RV air conditioner
Get yourself a ladder, and being careful where you step on the roof, give your A/C an up close and personal inspection.
Make sure that the plastic cover over the A/C is in good condition, and doesn’t have any cracks or splits in the plastic.
Rooftop A/C
Not only does this cover provide a streamlined and semi-attractive appearance to the appliance, it serves another very important purpose. It helps keep rainwater and snow from getting into the workings of the air conditioner, which would greatly shorten its functioning lifespan.
Wind, rain, and debris take their toll
The outer plastic cover might get damaged over time due to the harmful chemical interactions of the sun’s U/V rays, or physical trauma from being struck by low hanging branches at your favorite boondocking campsite.
Over a period of years, the effect of ultraviolet rays from the sun will actually weaken the plastic shroud to the point it may completely fall apart into pieces.
New shrouds can be purchased online, and you might consider obtaining a high-quality replacement so that you only have to buy it once.
Look for leaks and water intrusion
While you are on the roof, check that the air conditioner is securely mounted. There is a foam rubber gasket between the A/C and the roof. If the mounting is loose, rainwater may find its way into your RV, often with disastrous consequences.
When water enters your camper, it will likely follow roof rafters and wall framing and come out somewhere you would least expect. Often you’ll think the leak started in another location, and would never figure to check the integrity of the gaskets around your RV’s air conditioner.
If the water damage becomes severe enough, you could be faced with having to repair your RV’s wood flooring.
Fins should be straight
Check the condition of the cooling fins too. Bent-over vanes will restrict air flow through the unit and greatly reduce the air conditioner’s cooling ability. If you have bent fins, you can use a comb or dull knife to straighten them out. Do be gentle because if you puncture the condenser tubes you have just turned your air conditioner into a boat anchor!
RV air conditioners are single use
Did you know that when your air conditioner ages to the point it isn’t cooling, it becomes scrap metal? RV air conditioners are not designed to be recharged, and all but the simplest repairs are not economical. About the only part you can replace is the starting capacitor for the compressor motor.
What causes the capacitor to fail?
Trying to run the A/C on an electrical circuit rated for less than 30 amps.
Using a 15-amp reducer plug is like putting a choke hold on your RV’s air conditioner. You will get a low voltage condition—called a brownout. When the A/C can’t get its required amperage, it heats up and will eventually destroy itself.
Some large motorhomes and trailers will have two air conditioners powered through one 30-amp power cord. This type of setup will cycle one A/C on, and when it comes off, the cooling cycle will switch the compressor on for the other A/C.
This way, instead of requiring an even heavier power cord rated for 50 amps, the RV’s A/C system can function well with just a 30-amp power supply.
Part of your annual inspection should include running both A/C’s and verifying that proper load sharing occurs.
You don’t want to make it out west, with temps approaching 100° Fahrenheit, only to realize one of your A/Cs isn’t working properly.
Once you have inspected the outside of your air conditioning system, it’s time to go inside.
Make sure to inspect your air conditioner from inside the rig.
Indoor A/C
Under the plastic shroud on the ceiling of your RV, you’ll find one or two foam filter elements.
These can be washed with warm soapy water and reused.
While you have the shroud off you should vacuum the area, trying to clean as far into any ductwork as possible.
Though there are a couple different brands and models of RV air conditioners, maintenance, and annual care is pretty much the same for all of them.
None of them will last long trying to run them without adequate amperage to their power supply.
If you are using a portable generator, you need to have one that is rated for a minimum of 3,000 watts.
All brands of air conditioners are mounted to the roof in similar ways, and like with most things “cleanliness is next to Godliness.”
Remember, most RV air conditioners aren’t rechargeable. When they fail, they are pretty much junk. The best you can do is maintain them properly and hope they have a nice, long life.
Its your start capacitor.
Put a new one in, and it will quit humming.
You can buy a piercing valve for the larger (suction) line to charge the AC. You must first find out how the Refrigerant escaped.
It is a good idea to find out which refrigerant, of 3, or 4 you need for adding, or replacement of refrigerant. I use a meat basting
syringe to add an ounce of mineral oil when adding refrig.
If it needs freon, it has a leak, if you can find and fix the leak, it can last years longer. If you can’t locate the leak and repair it, it should be replaced.
I have a dometic air conditioner on a Layton travel trailer. When the a/c stopped six years ago I had friend/ ac technician braze a port on the unit and recharge it. It is still going. I agree with Scott that there are a few HVAC shops that will work on camper A/C’s.
i found your article very informative. at this time, my wife Karen and I have tackle a remodel job on a 91 motorhome that Karens father gave to us. I look foward to see other articles from you and other remodeling bloggers.
can my 1979 slide in truck camper be retro fitted for an A/C ? A small one would be great, I’ll be running on solar too
Thanks for sharing your tips Larry. Second you on wearing the mask if you have allergies!
I have a Winnebago Bextra that has basement ducted ac. The blowermotor (s) on the unit had to be replaced earlier last year.before it went out it would squeel. No belts, it has bearings that dried out. The motor and labor cost $300.00. The unit now runs like new. On another note, the ducts I have are both in the floor, and cieling. I went to a home hardware store, and bought a dryer duct brush kit which is like a chimney brush, just smaller and flexible. Using this and a canister vacuum wand and hose, cleaned the ducts. If you have allergies, wear eye, and mask protection. This and changing intake filters every 2 months depending on climate, pets, etc saved this full timer money, time, and allergy misery
Thanks for the reminder and the tutorial.
No portion of my AC unit is inside my RV; there’s just a grate over a duct (I assume) in the ceiling. Cleaning advice for that kind?
Hi Curtis: I’m brand new to your page…very infomative….thank you for ti…
Looking forward to more tips and tricks…
Happy Camping
Thanks for the clarification Scott!
I disagree that the A/C is not rechargeable. I own an HVAC business. I have recharged several camper A/C units for customers. It’s not a big deal to braze a port on the unit and recharge it. There are a few HVAC shops that will work on camper A/C’s, not a lot of them though.
Recharging a unit is just a temporary solution though. If you can get by recharging it once a year your doing good and you can limp along with it until you replace it. You will have to replace it…