Every year, thousands of RV owners damage their water systems by either skipping winterization entirely or doing it incorrectly. The result is cracked pipes, failed water pumps, damaged water heaters, and repair bills that can run $1,000 to $5,000 or more. As an RV technician, I see this damage every spring — and almost all of it is preventable.
This guide covers exactly how to winterize and de-winterize your RV the right way, every time.
WHEN TO WINTERIZE YOUR RV
Winterize your RV before temperatures drop to 32°F (0°C) at night, even if you plan to use the rig again. A single hard freeze is enough to crack PEX lines, burst fittings, and damage pump diaphragms. If you're in Wisconsin, Michigan, Minnesota, or any northern state, your window is typically October through November. Don't wait until the last minute.
THE TWO WINTERIZATION METHODS
Method 1: Compressed Air (Blow-Out)
This method uses compressed air to push all water out of the lines. You'll need a blow-out plug adapter that connects your compressor to the water fill port. Disconnect from city water, connect your compressor, then open each faucet one at a time — hot then cold — until only air blows through. Don't forget the toilet, outdoor shower, and any outside faucets. Blow out the water heater separately after bypassing it. This method is clean and uses no antifreeze, but requires proper technique to be thorough.
Method 2: RV Antifreeze
This is the more common method and is foolproof when done correctly. Use only non-toxic RV antifreeze (pink) — never automotive antifreeze. Bypass the water heater first to avoid filling it with antifreeze unnecessarily. Install a pump conversion kit to draw antifreeze directly from the jug through your water pump. Open each faucet — hot and cold — until you see pink fluid running continuously. Pour a cup of antifreeze down each drain to protect the P-traps. Flush a small amount through the toilet.
DON'T FORGET THESE COMMONLY MISSED STEPS
Ice maker water line if your RV has one. Washing machine connection if installed. Exterior shower connections. Low-point drains — these help but don't replace a full winterization. Water filter removal — leave the filter housing empty and cracked open over winter. Automatic ice maker shutoff. Water heater bypass verification — confirm the bypass valves are actually in the bypass position before pumping antifreeze.
HOW TO DE-WINTERIZE IN SPRING
De-winterizing is as important as winterizing and is commonly rushed. Start by reconnecting the water heater bypass valves to normal position. Connect to a fresh water source and flush every faucet until the pink antifreeze is completely gone and water runs clear. Sanitize the fresh water tank with a diluted bleach solution, let it sit for 4 hours, then flush completely. Check all connections for any drips before heading out on your first trip. Check the water pump for smooth operation and proper pressure.
GET THE COMPLETE SEASONAL BUNDLE
If you want a complete, step-by-step checklist system that covers both winterization and de-winterization — with nothing left out — our RV Winterize & De-Winterize Master Bundle is available as an instant digital download. It includes full checklists for both processes, a reference card for your antifreeze type and bypass positions, a seasonal storage checklist, and a spring startup inspection guide. Written by an 8-year professional RV technician. Never forget a step again.
Want a Professional to Handle Winterization This Year?
Skip the guesswork. Our certified mobile RV technician will come to your driveway, campsite, or storage lot in SE Wisconsin and handle your full winterization — properly, completely, and with a written record for your service log.
Schedule Winterization Service → | View Winterization Pricing →
Book Spring De-Winterization Too
We recommend scheduling both winterization (fall) and de-winterization (spring) together. Pre-book your spring slot when you schedule fall service — spring slots fill fast and you don't want to miss your first camping weekend waiting on a tech.