Knowing how to winterize rv washer setups is one of those chores that every RV owner dreads but absolutely has to do once the leaves start falling. If you've got the luxury of laundry on the road, you know how much of a game-changer it is to avoid the sketchy laundromats at the back of a campground. But that convenience comes with a trade-off: a whole new set of plumbing lines and pumps that can easily crack if they're left full of water when the mercury dips below freezing.
Repairing a washing machine in a tight RV closet is a nightmare I wouldn't wish on anyone. It usually involves a lot of swearing, scraped knuckles, and a hefty bill for parts that are surprisingly hard to find. Taking an hour or so to properly prep your machine for the winter is the best insurance policy you can buy.
Why You Can't Just Drain the Hoses
A common mistake I see people make is thinking that just draining the main RV water lines is enough. They'll open the low-point drains, empty the fresh tank, and assume the washer is fine because they haven't used it in a week. Unfortunately, washing machines are designed to hold a bit of water in the pump and the internal hoses to keep seals from drying out.
When that trapped water freezes, it expands. Since most of the internal components in modern RV washers—like those popular Splendide or Whirlpool units—are made of plastic or thin metal, they don't have much "give." One good hard freeze can snap a pump housing or a solenoid valve like a dry twig. By the time you find the leak in the spring, you've already got a flooded floor and a machine that won't cycle.
Gathering Your Supplies
Before you get started, you'll want to have everything ready so you aren't running back and forth to the shed. You don't need much, but you do need the right stuff.
First and foremost, you need non-toxic RV antifreeze. This is the pink stuff, not the green or orange stuff you put in your car. Automotive antifreeze is toxic and will ruin your plumbing (and potentially your health). I usually grab two or three gallons just to be safe, though you probably won't use it all on the washer alone.
You'll also want: * A small bucket or a shallow pan to catch drips. * Some basic hand tools like pliers (for stubborn hose connections). * A towel or two (because let's be honest, there's always a little splash). * A compressor if you prefer the "air blow-out" method, though the antifreeze method is generally considered safer for the pump.
The Antifreeze Method: The Gold Standard
The most reliable way to handle the "how to winterize rv washer" dilemma is to get antifreeze through every single part of the system. This includes the hot and cold intake valves, the internal drum, and the drain pump.
Step 1: Prep the Machine
Make sure the washer is empty. No stray socks left behind! Then, ensure your RV's main water system is already connected to a source of RV antifreeze. Usually, this means you've already bypassed your water heater and put your intake hose into a jug of the pink stuff, using the RV's internal water pump to prime the lines.
Step 2: Running the Intake Lines
Turn the washer on and set it to a "Warm" wash setting. This is a critical step because "Warm" forces the machine to open both the hot and cold water inlet valves. If you only run it on "Cold," the hot water line remains full of fresh water, which will freeze and crack the valve.
Let the machine fill until you see that distinct pink color starting to splash around in the drum. It doesn't need to be full—just enough to know the lines are flushed.
Step 3: Protecting the Pump
Once you see pink in the drum, switch the machine to a "Spin" or "Drain" cycle. This engages the drain pump and pushes the antifreeze through the internal exit hoses and out into your gray tank. You'll hear the pump change sound slightly when it's moving the liquid. Let it run for about 30 seconds to a minute, then shut the machine off.
Step 4: The Final Touch
I like to pour an extra cup or two of antifreeze directly into the drum and run the drain cycle one last time. This ensures the P-trap (the U-shaped pipe behind the washer) is also filled with antifreeze. That trap is often overlooked, but if the water in it freezes, it can crack the pipe or even push sewer smells back into your living space.
Using the Air Blow-Out Method
Some folks prefer not to use antifreeze inside their machines because they hate the smell or worry about staining. While it's possible to blow out the lines with compressed air, it's a bit more "fiddly."
If you go this route, you'll need an air compressor set to no more than 30-40 PSI. Anything higher than that can blow the seals right out of your washer's valves. You essentially follow the same steps—running the machine on a warm cycle while air is being pushed through the lines—until you hear nothing but air hissing into the drum.
The big risk here is the drain pump. Air doesn't always clear out the bottom of the pump housing perfectly. If you choose the air method, I still strongly recommend pouring at least a little bit of antifreeze into the drum and running a quick drain cycle just to protect the pump and the trap. It's better to have a little pink stuff to wash out in the spring than a broken pump to replace.
Don't Forget the Hoses
If you have a stackable unit or a setup where you can easily reach the back, it's a good idea to disconnect the intake hoses from the wall. Even if you've run antifreeze through them, those hoses can get brittle in extreme cold. Disconnecting them and letting them hang prevents any residual pressure from building up. Just make sure you have a bucket handy when you unscrew them, as there will always be a little bit of liquid left in the line.
While you're back there, check the little mesh screens in the hose connections. They tend to collect sediment from various campground water sources. Winterizing is the perfect time to clean those out so you have great water pressure when you hit the road again in the spring.
Specific Tips for Combo Units
If you're rocking a Splendide combo unit—the kind that washes and dries in the same drum—the process is mostly the same, but they can be a bit more sensitive to "air locks." If you're using the antifreeze method and the pump isn't pulling the pink stuff through, you might need to turn the machine off and on again to reset the cycle.
Also, these units often have a "lint trap" or a "pump filter" located at the bottom behind a small plastic door. Open that up and drain any remaining water into a shallow pan before you finish your winterization. It's a messy job, but that little reservoir is a prime spot for ice damage.
Waking the Washer Up in the Spring
Once the birds start chirping and you're ready to de-winterize, the process is pretty simple. You'll just want to run a "Heavy Duty" or "Clean Washer" cycle with no clothes in it. Use plenty of fresh water and maybe a splash of white vinegar or a dedicated washer cleaner tablet to get rid of any lingering antifreeze smell or residue.
I usually run two full cycles just to be sure. The first one gets the pink stuff out, and the second one ensures everything is fresh and clean for your first load of laundry. Check all your connections for leaks during that first run, just in case something didn't quite survive the winter.
Final Thoughts on the Process
Learning how to winterize rv washer equipment isn't exactly a fun way to spend a Saturday afternoon, but it's one of those "ounce of prevention" situations. If you're living in your RV full-time in a cold climate, you might even need to do a "light" version of this if you're expecting a freak cold snap.
The biggest thing to remember is the hot water line. It's the one everyone forgets because they usually wash on cold to save energy. But in the winter, that forgotten hot water valve is usually the first thing to go "pop" when the ice expands. Be thorough, use the pink stuff, and you'll be all set for another season of clean clothes on the open road. It beats the laundromat every single time!