How to Winterize Your Airstream Trailer: A Step-by-Step Guide

Winter is here, and if you're not planning on using your Airstream during the cold months, it’s crucial to properly winterize your trailer. By taking the necessary steps to protect it from freezing temperatures, you’ll prevent costly damage and ensure it’s ready to roll when spring arrives. Here’s a complete guide to winterizing your Airstream.

Why Winterizing Is Important

Airstreams are designed for adventure, but their plumbing systems, water lines, and appliances are susceptible to damage from freezing temperatures. Water expands as it freezes, which can cause pipes to burst, tanks to crack, and seals to fail. Properly winterizing your Airstream will save you from the headache of expensive repairs and help extend the life of your trailer.

Tools and Materials You’ll Need

Before you get started, gather the following materials:

• RV antifreeze (non-toxic, specifically for RV use)

• Water pump converter kit or a bypass kit

• Hose or water pump for antifreeze

• Wrench set and screwdrivers

• Cleaning supplies for the interior

• Air compressor (optional, if using the blowout method)

Step-by-Step Winterization Process

1. Drain the Water System

The first step in winterizing your Airstream is to drain all water from the system. This includes fresh water, the gray water tank, the black water tank, and all the lines.

• Drain the Fresh Water Tank: Open the fresh water drain valve and let all the water flow out. Be sure the tank is completely empty.

• Empty the Gray and Black Water Tanks: Empty these at a designated dump station. It’s a good idea to clean and flush the black tank after draining it.

• Drain the Water Heater: Turn off the water heater and make sure it’s cooled down before draining. Remove the drain plug and allow the water to drain out. Don't forget to open the pressure release valve to help it drain faster.

2. Bypass the Water Heater

To save on antifreeze and avoid introducing it into your water heater, it’s important to bypass it. Many Airstreams come with a bypass valve, but if yours doesn’t, you can install a water heater bypass kit.

• Close the valve leading into the water heater and open the valve that diverts water directly to the lines.

3. Blow Out the Water Lines (Optional)

Some owners prefer to blow out the water lines with compressed air before adding antifreeze. This ensures all remaining water is expelled.

• Set the compressor to no more than 40-50 PSI.

• Attach the compressor to the city water inlet and open each faucet (hot and cold) one at a time, allowing the air to push out any remaining water.

4. Add RV Antifreeze

Now, it’s time to protect your plumbing by adding non-toxic RV antifreeze to the system.

• Install the Pump Converter Kit: If your Airstream has a water pump bypass valve, use this to draw antifreeze directly from the jug. If not, you may need a hand pump or siphon method.

• Turn on the Water Pump and open each faucet (hot and cold) one at a time until you see pink antifreeze coming out. Don’t forget to do the same for the shower, outdoor showers, and toilet.

• Flush the Toilet: Hold the lever down until antifreeze runs through the system.

• Pour Antifreeze into P-Traps: Pour a small amount of antifreeze down each drain (kitchen sink, bathroom sink, and shower) to protect the P-traps from freezing.

5. Protect the Exterior

While your primary concern is protecting the plumbing, don’t forget about the exterior of your Airstream.

• Check Seals and Gaskets: Inspect the seals around doors, windows, and storage compartments. If any gaskets are cracked or worn, replace them to prevent moisture from entering during the winter.

• Clean and Wax the Exterior: Give your Airstream a good wash and apply a protective wax coating to shield the aluminum body from snow, ice, and salt buildup.

6. Prep the Interior

Winterizing the interior ensures your Airstream is clean, safe, and ready for storage.

• Clean the Refrigerator: Empty the fridge and freezer, wipe it down, and leave the doors open to prevent mold growth.

• Remove All Perishable Items: Clear out any food, snacks, or perishables that could attract pests or spoil over the winter.

• Remove or Cover Upholstery: Consider removing any fabrics like cushions or bedding that could trap moisture. If you leave them inside, cover them with breathable fabric or plastic covers.

7. Disconnect the Battery

If you’re storing your Airstream in freezing temperatures, it’s best to remove the battery and store it in a warmer location. Cold weather can significantly reduce battery life.

• Turn off the master power switch, then disconnect the battery.

• Charge the battery fully before storing it in a cool, dry place. Check the charge periodically over the winter.

8. Seal and Store

Once everything is winterized, seal up the trailer properly.

• Close all windows, roof vents, and storage compartments.

• Use breathable covers if you’re storing the Airstream outdoors, as this will help prevent condensation inside the trailer.

Additional Tips:

• Consider Indoor Storage: If you have access to indoor storage, it’s the best option to protect your Airstream from snow, ice, and freezing conditions.

• Rodent Prevention: Seal any possible entry points where rodents could sneak in. You might want to place mothballs, peppermint oil, or other repellents in storage areas.

• Monitor Throughout Winter: If possible, check on your Airstream periodically during winter to ensure no issues have arisen.

De-Winterizing in Spring

When spring rolls around, de-winterizing is as simple as flushing the antifreeze out of the system, refilling the water tanks, and re-engaging the water heater. Follow your Airstream’s manual for specific de-winterizing steps, and be sure to check for any leaks or maintenance needs before hitting the road again.

Winterizing your Airstream might seem like a chore, but it’s a crucial step in maintaining your investment and ensuring it lasts for many adventures to come. With careful preparation, you can protect your trailer from freezing temperatures and look forward to a hassle-free start when the warmer weather returns.

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👉 Contact Sean Crimmins and Carpe Aluminum RV today to get started!Visit our website at www.carpealuminumrv.com or call us at 251-423-6384. Let’s turn your Airstream dreams into reality!