How to Winterize Your RV: Step-by-Step Guide

Winterizing your RV protects it from freezing temperatures and costly damage. Here’s a quick summary of what you need to do:

Drain all water systems: Empty freshwater, black, and gray tanks, and remove water from pipes to prevent freezing.
Use RV antifreeze: Circulate antifreeze through plumbing to safeguard pipes, faucets, and drains.
Seal and protect: Close gaps, use moisture absorbers, and apply exterior covers to prevent cold air, moisture, and pests.
Prepare the engine and battery: Add fuel stabilizer, check antifreeze levels, and store the battery in a warm, dry place.

Why it matters: Skipping winterization can lead to repair costs over $3,000, while DIY winterization costs as little as $50–$150. Don’t wait - prepare your RV before temperatures drop below freezing for 24+ hours.

How To Winterize Your RV: An Easy Step-by-Step Guide & Checklist

Required Tools and Supplies

Before diving into RV winterization, make sure you have the right tools and supplies on hand. This will make the process more efficient and help protect your RV during the colder months.

Basic Winterization Tools

Here’s a rundown of the must-have items:

RV Antifreeze and Related Equipment:

2–4 gallons of propylene glycol-based RV antifreeze (usually pink or red in color)
A water heater bypass kit
A water pump converter kit or tubing
A blowout plug adapter (for the compressed air method)

Hand Tools:

An adjustable wrench set
A socket set for removing drain plugs
Flathead and Phillips screwdrivers
Pliers to handle tight or hard-to-reach areas

Air System Components:

An air compressor (for the blowout method)
A pressure regulator (set to 30–40 PSI for safety)
An air blow-out adapter

Winter Protection Add-ons

For added peace of mind, consider these optional items to protect your RV during storage:

Moisture Control:

Products like Dri-Z-Air or DampRid to absorb excess moisture
A dehumidifier (if you have access to electricity)
Vent covers to allow proper air circulation while keeping out debris

External Protection:

An RV cover that fits your model to shield it from the elements
Tire covers to block harmful UV rays
Covers for propane tanks
Insulating window covers to help maintain interior temperature

Storage Protection:

Non-toxic rodent repellents to keep pests at bay
Cedar chips or dryer sheets as an alternative pest deterrent
Exterior sealant to patch up any cracks or gaps
Fuel stabilizer to preserve the quality of any fuel left in the tank

Essential Safety Items	Purpose	Recommended Amount
RV Antifreeze	Protects the plumbing system	2–4 gallons
Moisture Absorbers	Prevents mold and mildew	1 per 100 sq ft
Rodent Protection	Keeps pests away	4–6 placement points
Fuel Stabilizer	Maintains fuel quality	1 oz per gallon

Once you’ve gathered these tools and supplies, you’ll be ready to drain and prep your RV’s water systems for winter storage.

Step 1: Empty All Water Systems

Draining your RV's water systems is a crucial step to avoid expensive freeze damage. When water freezes, it expands by about 9%, which can lead to cracked pipes and damaged fittings throughout your RV's plumbing system.

Drain Water Tanks

Start by draining the three water tanks in your RV:

Freshwater Tank:

Locate the drain valve, usually found underneath the RV near an exterior wall.
Open the valve fully to let the water drain completely.
Keep the valve open until no water is left in the tank.

Black and Gray Water Tanks:

Drive to a certified RV dumping station.
Securely connect your sewer hose to prevent any spills.
Empty the black tank first, followed by the gray tank. The gray water helps rinse out the sewer hose.
If your RV doesn’t have a built-in flushing system, use a tank cleaning wand for a deeper clean.
Tilt the RV slightly toward the drain side to ensure the tanks are emptied thoroughly.

"If you don't protect the RV plumbing system, any water remaining in the water lines or tanks can freeze, expand, and break fittings and lines. This can be a very costly mistake next spring." - El Monte RV Sales

Pro tip: Once the tanks are drained, apply WD-40 to the termination valves for smoother operation. To protect the black tank's valve areas, consider adding one gallon of RV antifreeze to prevent residual water from freezing.

After draining the tanks, it’s time to clear out any remaining water from the pipes.

Remove Water from Pipes

Follow these steps to ensure all water is removed from your RV's plumbing system:

Step	Action	Maximum PSI
Preparation	Attach a blowout plug to the city water inlet	N/A
Air Pressure	Set the air compressor pressure	45 PSI
Clear System	Open all faucets systematically	N/A

Find Low-Point Drains
Locate the low-point drains near the water heater. These are essential for getting rid of any trapped water in the system.
Set Up the Air Compression System
Connect your air compressor to the city water connection using a blowout plug adapter. Make sure to set the pressure to no more than 45 PSI to avoid damaging the plumbing.
Open All Water Outlets
Work through each water outlet systematically:
- Turn on all interior faucets (both hot and cold).
- Flush the toilets several times.
- Run water through shower heads and any outdoor shower.
- Test all spray attachments.
- Continue until no water flows from any outlet.

Step 2: Add RV Antifreeze

Once you've cleared your water systems, the next step is to protect your RV's plumbing from any leftover moisture by using antifreeze. This ensures your pipes are safeguarded against freezing temperatures.

Set Up Water Heater Bypass

Bypassing the water heater is a smart move - it reduces the amount of antifreeze you'll need to just 2–4 gallons. Start by locating your RV's water heater, usually behind an access panel, and identifying the bypass valve system.

Most RVs have one of the following valve setups:

Valve System	Location	Correct Position
Three-valve	Hot/cold lines and bypass	Cold and hot lines set perpendicular; bypass set parallel
Two-valve	Hot and cold lines	Both valves set parallel
One-valve	Single bypass	Valve set perpendicular to the line

Here’s what to do next:

Remove the water heater's fuse.
Make sure the heater tank is completely empty.
If your RV doesn’t have a bypass valve, consider having one installed by a professional.

Once the water heater is bypassed, you’re ready to circulate antifreeze through the plumbing system.

Introduce Antifreeze

With the bypass in place, it's time to introduce antifreeze into the system to protect every fixture. Use a water pump conversion kit or connect tubing to the freshwater line leading to a container of antifreeze. Open each fixture one at a time, starting with the faucet nearest the pump, and let the antifreeze run until you see pink liquid.

Here’s where antifreeze needs to flow:

Hot and cold water taps
Showerheads (including outdoor showers)
Toilets (flush until the bowl shows pink antifreeze)
City water inlet (remove the screen and press the valve)

Don’t forget to protect your P-traps and drains. Pour antifreeze directly into them:

1–2 cups down each sink drain
2–4 quarts into the RV toilet
1 quart into each P-trap

Pro tip: Always keep an extra gallon of antifreeze on hand. If an unexpected cold snap hits, this small precaution can save you from costly plumbing repairs.

Step 3: Protect Inside and Outside

Shielding your RV from winter's harsh conditions - both inside and out - is critical to avoiding costly damage. Sealing gaps and controlling moisture are key steps to ensure your RV stays in great condition during storage.

Seal External Gaps

Take a close look at your RV's exterior for any gaps that might let in cold air or moisture.

Roof and Seams
Inspect the roof thoroughly, focusing on seams around vents, skylights, and air conditioning units. Use the right sealants for horizontal and vertical surfaces. Pay extra attention to the corners where walls meet - these spots are notorious for water damage.

Windows and Doors
Examine window seals for any signs of wear or damage. Re-caulk around door frames and windows to ensure a tight seal. If the weather stripping is worn out, replace it to block drafts effectively.

Here’s a handy checklist to guide your inspection and sealing efforts:

Area	What to Check	Recommended Sealant Type
Roof	Flashing, seals, corners	Self-leveling sealant
Walls	Corner joints, slide-out seams	Non-self-leveling sealant
Windows	Rubber seals, frame edges	Silicone caulk
Vents	Perimeter seals, mounting screws	All-weather sealant

Once the exterior is properly sealed, it’s time to focus on safeguarding the interior.

Prevent Interior Damage

Managing moisture and pests inside your RV is essential to prevent mold, mildew, and other issues.

Moisture Control
Use a dehumidifier suitable for your RV’s size, and place moisture absorbers in key areas like bathrooms, kitchens, closets, and under mattresses. These steps will help keep humidity levels in check.

Ventilation Tips
Leave closet doors open and use breathable mats under mattresses to improve airflow. Moving mattresses slightly away from exterior walls can also help reduce condensation buildup.

Pest Prevention
Once moisture and ventilation are under control, turn your attention to keeping pests out:

Remove all food items.
Clean all surfaces thoroughly.
Seal potential entry points with steel wool.
Place rodent repellents in storage compartments.

To maintain air circulation during storage, leave roof vents slightly open and cover them with vent covers to keep out precipitation. This simple step helps prevent stagnant air, reducing the likelihood of mold growth.

Step 4: Prepare Engine and Battery

Getting your engine and battery ready is crucial to prevent damage and ensure your RV starts without a hitch when spring arrives.

Winterize the Engine

Start by changing the oil and filter, and make sure the radiator is filled with the appropriate antifreeze.

Fuel System Protection
Fill up the fuel tank, add a fuel stabilizer, and let the engine run for 10–15 minutes to circulate the stabilizer throughout the system.

System	Winterization Task	Recommended Frequency
Engine Oil	Change oil and filter	Before storage
Fuel System	Fill tank and add fuel stabilizer	Annually
Coolant	Check antifreeze levels	Twice yearly
Filters	Replace air and fuel filters	Annually

Additional Engine Care
Take a moment to inspect belts, hoses, and filters. Check both brake and washer fluid levels. For carbureted engines, either drain the carburetor bowl or run the engine until it’s dry. Once these tasks are done, turn your attention to the battery to complete the winterization process.

Store Battery Properly

Proper battery storage is key to avoiding issues when it’s time to hit the road again.

Removal and Cleaning
Start by removing the battery from your RV, disconnecting the negative terminal first. Clean the terminals using a mixture of baking soda and water to remove any corrosion.

Storage Environment
Place the battery in a warm, dry indoor space. Use a piece of cardboard or wood underneath it to keep it insulated from cold flooring.

Maintenance During Storage
Hook up the battery to a maintainer and check its charge monthly. For lead-acid batteries, regularly monitor the water levels and refill with distilled water if needed.

"When you store your RV during the offseason, you also need to remove your battery and keep it in a warm location." - Campers Inn

Special Considerations
If you’re using LiFePO4 batteries, ensure they’re fully charged, disconnected, and stored in a temperature-controlled area, especially if temperatures dip below –10°F.

Conclusion: Winter Storage Checklist

Before storing your RV for the winter, run through this checklist to ensure everything is properly prepared:

System	Essential Tasks	Verification
Water Systems	Drain tanks and lines, add RV antifreeze	Ensure antifreeze has reached all outlets
Engine & Fuel	Change the oil, add fuel stabilizer, top off antifreeze	Confirm the fuel tank is full
Battery	Disconnect and store in a warm, dry place	Check the battery's voltage
Exterior	Seal openings, use tire covers, and apply an RV cover	Inspect for any gaps or vulnerabilities
Interior	Remove batteries from devices and open cabinets for airflow	Check for any signs of moisture

Final Steps

Double-check that all systems are securely shut down and prepared for storage.

Professional Support

If you'd rather leave the winterization to experts, The RV Smith offers professional services to get the job done right. Typical costs range from $150 to $300.

Regular Monitoring

Even after your RV is stored, monthly inspections can prevent issues. Look out for:

Moisture buildup
Signs of pests
Battery charge levels
Tire pressure
Condition of the RV cover

Consistent checks help keep your RV in top shape until you're ready to hit the road again. Reach out to us today to schedule your winterization service!

FAQs

What happens if I don’t winterize my RV, and how can I prevent damage?

If you skip winterizing your RV, you could face serious headaches like burst pipes and cracked water tanks due to freezing temperatures. These kinds of damage can lead to hefty repair bills - and your insurance might not even cover them. On top of that, any leftover water in your system can stagnate, encouraging bacteria to grow and potentially harming your plumbing.

To avoid these costly issues, take the time to drain all water lines completely, use RV-safe antifreeze, and double-check that no water remains in your tanks. Don’t forget to remove your batteries and store them in a warm, secure spot to keep them from freezing. The best time to winterize your RV? Before the first freeze hits - this way, your vehicle stays safe and ready to go when warmer weather returns.

How can I tell if I’ve added enough RV antifreeze to the plumbing system?

To ensure you've added the right amount of RV antifreeze, you'll typically need around 2 to 4 gallons of non-toxic antifreeze. The exact amount depends on the size of your plumbing system, but this range usually covers filling the pipes and keeping them safe from freezing temperatures.

Run the antifreeze through all your faucets, showers, and toilets until you see it flowing out of each one. Don't overlook pouring some into the sink and shower drains to protect the P-traps. Once antifreeze is visible at every tap and drain, you can rest assured that your system is ready for winter.

How do I properly maintain my RV battery during winter storage?

To keep your RV battery in great shape during winter storage, here’s what you should do:

Take the battery out of your RV and inspect the water levels. If needed, add distilled water to top it off.
Charge the battery fully before storing it in a warm, dry spot indoors, like your basement or garage. Make sure it’s not sitting directly on a cold surface - place a piece of wood or cardboard underneath as insulation.
Use a battery maintainer to keep it charged throughout the winter months.
Check the charge once a month to make sure it doesn’t drop too low.

For extra protection, disconnect the negative cable to stop any small power drains. Following these steps will keep your battery ready to roll when spring comes around.