How to winterize your coach

Here is a comprehensive RV winterization list to help you protect your investment from cold-weather damage.

There are two primary methods for winterizing your RV's plumbing:

1. Compressed Air (Blowout) Method: Uses an air compressor to blow all water out of the lines.

2. Antifreeze Method: Uses non-toxic RV antifreeze to fill the plumbing system, preventing any remaining water from freezing and expanding. "Recommended"

This checklist will focus on the Antifreeze Method, as it is the most common and provides the surest protection.

Required Supplies & Tools

• Non-toxic RV/Marine Antifreeze: 2-3 gallons (Propylene Glycol-based, NOT automotive antifreeze).

• Water Heater Bypass Kit: Many RVs have this pre-installed. If not, you will need to install one.

• Water Pump Converter Kit (or Siphon Hose): To pump antifreeze directly from the jug into your plumbing.

• Tools to remove drain plugs: Wrench or socket set (often a 15/16" or 1-1/16" socket for the water heater anode rod).

• Screwdrivers: For accessing panels (like the water pump or water heater bypass valves).

• Blowout Plug (Optional): A small adapter that connects an air compressor to your city water inlet. This is highly recommended to blow out excess water before adding antifreeze.

• Air Compressor (Optional): If using a blowout plug. Set the regulator to 40-50 PSI MAXIMUM.

• Towels/Rags: For inevitable drips and spills.

RV Winterization Checklist: Step-by-Step

Section 1: Drain All Water

1. Drain Holding Tanks:

   • Take your RV to a dump station.

   • Completely drain the black water tank first.

   • Thoroughly flush the black tank using its built-in flush system or a tank wand.

   • Completely drain the gray water tank.

   • Close both tank valves.

2. Drain Fresh Water Tank & Water Heater:

   • Turn off all water sources: Disconnect from city water, turn off the water pump, and ensure the water heater (both electric and gas) is OFF and cool to the touch.

   • Open all faucets (hot and cold), including sinks, shower, and any outdoor shower.

   • Flush the toilet until no more water comes out.

   • Locate and open the low-point drains (you will have at least one for hot and one for cold). Let all water drain out.

   • Go outside to the water heater access panel. CAREFULLY open the pressure relief valve at the top to release any pressure.

   • Remove the drain plug or anode rod at the bottom of the water heater. Water will rush out.

   • Tip: This is a good time to inspect your anode rod. If it's more than 75% corroded, plan to replace it in the spring.

Section 2: Clear the Lines & Bypass Water Heater

1. Bypass the Water Heater:

   • Locate the back of your water heater (often under a sink, bed, or behind an access panel).

   • Find the bypass valves. You will typically have a 1, 2, or 3-valve system.

   • Set the valves to the BYPASS position. This stops water/antifreeze from entering the water heater tank. (You don't want to waste 6-10 gallons of antifreeze filling a tank that doesn't need it).

   • Re-install the water heater drain plug or anode rod.

2. Bypass Water Filters (if equipped):

   • Remove any inline or whole-house water filter cartridges. These will be damaged by antifreeze.

   • Install the bypass hose or cap that came with your filter system.

3. (Optional but Recommended) Blow Out Lines:

   • Close all faucets and low-point drains.

   • Attach a blowout plug to the city water inlet.

   • Set your air compressor regulator to NO MORE than 40-50 PSI.

   • Connect the compressor to the plug.

   • Go inside and, one by one, open each faucet (hot and cold sides separately) until only air "sputters" out. Don't forget the shower and toilet.

   • Disconnect the compressor and remove the blowout plug.

Section 3: Add Antifreeze

1. Set Up the Water Pump:

   • Locate your 12V water pump.

   • Install your water pump converter kit or attach a siphon hose to the inlet side of the pump.

   • Place the other end of the hose directly into a jug of non-toxic RV antifreeze.

2. Pump Antifreeze Through the System:

   • Turn on the water pump. It will start to draw antifreeze from the jug.

   • Go to the faucet closest to the pump (usually the kitchen sink).

   • Slowly open the cold tap until a steady stream of pink antifreeze flows out. Close it.

   • Slowly open the hot tap until a steady stream of pink antifreeze flows out. Close it.

   • Repeat this process for every single faucet and fixture:

     • Bathroom sink (hot and cold)

     • Shower (hot and cold, and don't forget the shower wand)

     • Outdoor shower (hot and cold)

     • Toilet (flush until pink antifreeze appears in the bowl)

     • If you have a washing machine or ice maker, consult your owner's manual for specific winterization steps.

3. Protect Drains:

   • Pour ~1 cup of antifreeze down every drain (sinks and shower) to fill the P-traps.

   • Pour ~1 cup of antifreeze into the toilet bowl to protect the seal.

   • Turn off the water pump.

   • Close the antifreeze jug and store any leftover antifreeze.

Section 4: Final Interior & Exterior Tasks

1. Interior Prep:

   • Remove ALL food and drinks to prevent freezing, bursting, and attracting pests.

   • Remove anything that can freeze (medications, liquids, canned goods).

   • Clean and prop open the refrigerator and freezer doors to prevent mold.

   • Remove all linens, towels, and clothing.

   • Close all windows and roof vents.

   • Turn off all propane tanks at the source.

   • Remove batteries from smoke detectors, carbon monoxide detectors, and clocks.

2. Pest Control:

   • Inspect the RV exterior and underbelly. Seal any cracks or holes with steel wool or expanding foam to block rodents.

   • Place mouse traps or rodent deterrents (peppermint oil, etc.) inside the RV. Do not use poison, as the pest may die inside your walls.

3. Batteries & Tires:

   • Batteries: Fully charge your house and/or chassis batteries. A fully charged battery is less likely to freeze. For best results, disconnect the negative terminals or turn off the main battery disconnect switch. Even better, remove the batteries, bring them indoors, and store them on a piece of wood (not concrete) in a cool, dry place. Consider using a battery tender to maintain their charge.

   • Tires: Inflate tires to the maximum cold PSI listed on the sidewall. If storing for many months, consider parking the RV on leveling blocks or planks to protect the tires from ground moisture. Cover the tires to protect them from UV damage.

4. Cover & Storage:

   • Thoroughly wash and wax the exterior to protect the finish.

   • Cover the RV with a breathable RV cover. Do not use a plastic tarp, as it will trap moisture and can cause mold and mildew.

   • If possible, park the RV on a solid, dry surface (like gravel or pavement) and slightly sloped to allow water to run off the roof.

5. Generators

   • If possible, drain carb bowl or add fuel stabilizer to fuel tank and run generator.

   • Great time to service generator and clean out compartment.