Winterizing ice maker in rv units is one of those chores that often gets overlooked until a pipe bursts or a solenoid valve cracks during the first deep freeze. It's easy to remember the sink faucets and the shower, but that tiny little water line tucked behind your refrigerator is surprisingly fragile. If you've ever had to pull out a heavy RV fridge just to replace a $50 plastic valve, you know exactly why taking twenty minutes to do this right is worth the effort.
Most modern rigs come with residential-style fridges or high-end RV refrigerators that make ice on demand. While it's a luxury in the summer, it's a bit of a liability when the temperature drops. The problem is that the water line feeding the ice maker is very thin, and it's usually tucked against the outer wall of the RV where there's almost no insulation.
Why Ice Makers Are Different
You might think that just running RV antifreeze through your lines or blowing out the system with air is enough. For your kitchen sink, sure, that works great. But for an ice maker, the water is controlled by a solenoid valve that only opens when the freezer tells it to. If that valve is closed—which it usually is—neither air nor antifreeze is going to get into those internal lines unless you "force" the issue.
If you leave water trapped inside that valve, it will expand as it freezes and crack the plastic housing. Come spring, you'll turn your water on and find a steady stream of water leaking out from under the fridge. Let's avoid that headache and look at the two main ways to get the job done.
The Compressed Air Method (The "Dry" Way)
A lot of RVers prefer using compressed air because it means they don't have to taste "pink stuff" in their ice cubes for the first month of next season. It's a clean method, but you have to be careful with your pressure settings.
First, you'll want to hook up your air compressor to the city water inlet using a blowout plug. Set your compressor to no more than 30 or 40 PSI. Anything higher can blow the seals right out of your plumbing.
The trick here is getting that solenoid to open. With the air pressure applied to the system, turn the refrigerator on and make sure the ice maker is in the "on" position. Now, you just have to wait. Depending on the model, it might take a while for the ice maker to cycle and open the valve to "call" for water (which is now just air).
Some people prefer to use a "jumper wire" to manually trigger the solenoid. This is a bit more technical and involves removing the cover on the front of the ice maker unit and jumping two specific points (usually labeled V and L) with a small piece of insulated wire. If you aren't comfortable with electricity, don't do this. Just let the fridge run until you hear the "pssst" sound of air rushing through the line into the ice mold.
The RV Antifreeze Method (The "Wet" Way)
If you live in a place where it stays below zero for weeks at a time, you might feel more comfortable seeing that pink RV antifreeze actually sitting in the lines. This is a solid approach, but there's a catch: you absolutely cannot leave your water filter in.
Before you start, find the water filter for your fridge. It's usually a canister inside the fridge or a horizontal tube at the bottom. Remove it and install the "bypass plug" that (hopefully) came with your RV. If you run antifreeze through a carbon filter, you'll ruin the filter and probably end up with a mess.
Once the filter is bypassed, turn on your RV's water pump and put the intake hose into a jug of pink RV antifreeze. Open your faucets until they run pink, then head to the fridge. Just like the air method, you need the ice maker to cycle. You'll have to wait until the unit tries to make a batch of ice. When it does, it'll pull that pink antifreeze into the mold. Once you see pink slush or liquid in the ice tray, you know the line and the valve are protected.
Dealing with Residential Fridges
If your rig has a big Samsung or Whirlpool residential fridge, winterizing ice maker in rv systems becomes a bit more involved. These units often have internal reservoirs for cold water dispensers as well.
For these, you really need to make sure you've flushed the water dispenser until it runs pure pink (or pure air). If your fridge has an "Ice Home" or "Power Crush" feature, you can sometimes use those to speed up the cycling process. Just keep an eye on the tray. Once you see that pink color, turn the ice maker off so it doesn't keep trying to make "antifreeze cubes" all winter long.
The Low-Point Drain Trap
Don't forget about the supply line behind the fridge. Even if you've cleared the internal lines, sometimes a "dead leg" of pipe exists between the main water line and the back of the refrigerator.
If you can access the back of the fridge through the exterior vent panel, it's a smart move to disconnect the water line at the solenoid valve. Let any residual water drain out into a small bowl. This is also a great time to inspect the line for any signs of wear or kinking. If you're using the air method, you can leave this disconnected over the winter just to be safe.
A Note on the Solenoid Valve
The solenoid valve is the heart of the system, and it's almost always located at the very bottom of the fridge, near the back. It's a small plastic block with wires attached to it. Because it's so low and often sits right against the floor, it's the first thing to freeze.
If you're worried that you didn't get enough air or antifreeze through it, some folks use a hairdryer to gently warm the area before they start the winterization process to ensure any existing ice hasn't already blocked the flow. Just don't get it too hot—you're dealing with plastic and thin wires.
Common Mistakes to Avoid
One of the biggest mistakes is forgetting to empty the ice bucket. It sounds silly, but if you leave a half-full bucket of ice in there, it'll melt during the first warm spell, then refreeze into a giant block of ice that can crack the plastic bucket or jam the auger. Always dump the ice and wipe the bin dry.
Another mistake is neglecting the water dispenser. If your fridge has a water tap on the door, that line needs to be winterized too. It's usually the same supply line as the ice maker, but it has its own separate trigger. Run it until you see pink or hear air, just like the faucets.
Getting Ready for Spring
When the birds start chirping and it's time to head back out, you'll need to reverse the process. If you used antifreeze, you'll want to flush the system with fresh water for a long time.
I usually run the water dispenser for at least two gallons to get the taste out. For the ice maker, let it cycle through five or six batches of ice and throw them all away. You'll be able to tell if there's still antifreeze in there because the cubes will have a weird tint or a chemical smell. Once the ice is clear and tastes like well, nothing you're good to go. Don't forget to pop a brand-new water filter in at this point!
Wrapping It Up
Taking the time for winterizing ice maker in rv setups isn't the most exciting part of owning a motorhome or travel trailer, but it's definitely one of the most practical. It saves you from the inevitable "spring leak" and ensures your first trip of the year is spent relaxing, not hunting down plumbing parts at a local hardware store.
Whether you choose the air method or the antifreeze method, the secret is all in the solenoid. Get that valve open, get the water out (or the pink stuff in), and you can rest easy knowing your fridge will be ready for the summer heat. Stay warm out there, and happy trails!