If you own an RV in St. Cloud, Minnesota, you know winter is not mild. Long stretches of freezing weather can do real damage to your camper if it is not prepared the right way. A cracked water line or damaged pump can turn into an expensive repair by spring.

At All Campers, we help RV owners protect their investment every year. If you would like to handle it yourself, this guide will walk you through the process in plain, simple steps.

Why Winterizing Is So Important

Water expands when it freezes. Even a small amount left inside a pipe, fitting, or valve can cause it to split. You may not notice the damage until you hook up water next season and see leaks inside cabinets or under the RV.

Winterizing removes water from the plumbing system and replaces it with RV antifreeze that will not freeze in cold temperatures. It also gives you a chance to inspect your camper before it sits for months.

Step 1: Drain All Water Tanks

Start by turning off the water heater and allowing it to cool completely. Never drain a hot water heater.

Then:

  • Drain the fresh water tank
  • Empty the gray and black holding tanks at an approved dump station
  • Open all hot and cold faucets
  • Open the low point drains
  • Remove the drain plug or anode rod from the water heater

Let everything drain fully. Take your time with this step. The more water you remove now, the better.

Step 2: Bypass the Water Heater

Most RVs have a bypass valve behind the water heater. Turn it to bypass mode so antifreeze does not fill the water heater tank. This saves several gallons of antifreeze and makes spring startup easier.

If you are not sure where your bypass valve is located, check your owner’s manual.

Step 3: Blow Out the Lines

Blowing out the lines adds extra protection before adding antifreeze.

You will need:

  • An air compressor
  • An RV blowout plug that connects to the city water inlet

Set the air pressure between 30 and 40 PSI. Open one faucet at a time until only air comes out. Do this for:

  • Kitchen sink
  • Bathroom sink
  • Shower
  • Outside shower
  • Toilet

Do not rush. This step helps prevent leftover water from sitting in low spots.

Step 4: Pump RV Antifreeze Through the System

Use only non toxic RV antifreeze. Automotive antifreeze is unsafe and should never be used in an RV plumbing system.

You can pump antifreeze into the system using your RV’s winterizing kit or by disconnecting the intake line from the water pump and placing it directly into the antifreeze bottle.

Turn on each faucet, both hot and cold, until you see pink antifreeze flowing out. Do not forget:

  • Shower head
  • Toilet valve
  • Outside kitchen or sink if your RV has one

Pour about a cup of antifreeze into each drain to protect the P traps.

Leave a small amount in the toilet bowl to protect the seal.

Step 5: Take Care of the Battery

Cold weather can shorten battery life. You have two good options:

  • Remove the battery and store it in a dry place
  • Leave it installed and connect it to a battery maintainer

Clean the terminals before storage and check for corrosion.

Step 6: Protect the Exterior

Winter prep is not only about plumbing.

Take time to:

  • Wash and wax the exterior
  • Inspect roof seals and reseal if needed
  • Cover tires or park on boards to protect them from frozen ground
  • Close vents and windows tightly

If you store your RV outside, consider using a breathable RV cover made for winter conditions. Read about How to Underpin a Camper

Step 7: Prepare the Interior

Before closing the door for the season:

  • Remove all food
  • Clean the refrigerator and prop the door open
  • Vacuum and wipe down surfaces
  • Place moisture absorbers inside to reduce damp air

These small steps help prevent odors and mold during storage.

Common Mistakes to Avoid

Many RV owners forget small details that cause problems later. Watch out for:

  • Forgetting the outside shower
  • Skipping the ice maker line if your RV has one
  • Using too much air pressure when blowing out lines
  • Leaving water in the water filter housing

If you are unsure about any part of the process, it is better to ask than guess. Read about How to Keep a Camper Cool in the Summer

When to Schedule Professional Winterizing

Some RVs have complex plumbing systems, tank heaters, or residential appliances that require extra care. If you would rather have peace of mind, professional winterizing can save time and prevent costly mistakes. Also read about how to dewinterize a camper

At All Campers in St. Cloud, we provide RV winterizing, storage prep, and full repair services. Whether you need a quick winter service or help fixing damage from last year, our team is ready to help.

Taking a few hours to winterize your RV now can save you hundreds or even thousands of dollars later. When spring arrives, you will be able to focus on planning your next trip instead of dealing with unexpected repairs.