Winterizing an RV: The Plumbing and Antifreeze Walkthrough

The first fall I owned an RV, paying a shop to winterize it felt like the safe move. Then I watched the tech do it, realized it was maybe two hours of straightforward work, and never paid for it again. It's satisfying, it saves real money, and it forces you to actually know your own rig.

If you've never done it, don't let the task list spook you. Think of it as a seasonal checkup with one job that genuinely matters above all others: getting every drop of water out of the plumbing before it freezes. Cracked water lines are the disaster you're preventing, and they're entirely avoidable.

The plumbing is the whole ballgame

Most of winterizing an RV is just preventing frozen, burst water lines, and it breaks into clear steps. Drain the fresh water tank first by opening the faucets until they run dry. Do the same for the showers, the toilet, the tanks and bowls — everywhere water hides. An air compressor helps siphon out what gravity leaves behind.

Then bypass your water heater using the bypass kit your manufacturer provides, so you're not wasting antifreeze filling a six-gallon tank. A quality rv water pump and a basic rv water heater bypass kit make this part painless if your rig didn't come set up for it.

Run antifreeze until you see pink

With the lines drained, you treat whatever water remains so it can't freeze. Pump rv antifreeze through the system using a pump conversion kit — a tube that pulls the solution from its jug straight into the water lines. Then check your work the simple way: open one faucet at a time and watch.

When the faucet runs pink, the antifreeze has reached it. Go around and confirm every faucet, shower, and toilet does the same. Finish by pouring four or five ounces down each drain to protect the traps. The pink-water check is foolproof — if you see it everywhere, the plumbing's protected.

Clean it out so rodents don't move in

Pull every consumable — food, drinks, medicines, anything edible. Rodents are hunting for a warm winter home, and a stocked RV is an open invitation, and they'll wreck whatever they nest in. Close off every little gap they could squeeze through with brass wool or aluminum; a roll of steel wool stuffed into the entry points does more than any trap.

Clean the refrigerator out completely and prop it open so air circulates and it doesn't turn into a science experiment over the winter.

Shut down appliances and manage moisture

Turn off all the appliances. Give the AC a clean before you shut it down and cover it with plastic. Then deal with moisture, because a sealed-up RV breeds mold and mildew if the damp has nowhere to go. Some owners use chemical absorbents; others swear by charcoal. A few tubs of moisture absorber in the cabin keep the air dry through the cold months.

This step is easy to overlook and annoying to discover in spring as a black bloom along a seam. Spend the five minutes.

Cover it, then check it twice

Cover the RV to shield it from snow and water, but use a breathable rv cover — one that doesn't trap moisture against the body, which just recreates the mold problem you fought above. Then do the boring final pass: walk it once more looking for an unplugged appliance you missed, an open window, a light left on.

That double-check is what separates a clean spring startup from a heartbreaking surprise. Take the extra ten minutes, and your RV waits out the winter exactly as you left it.