Before you begin: Use your RV and component manuals for model-specific procedures. Stop and use a qualified professional for electrical, propane, structural, or other work beyond your training.
How much RV antifreeze do I need?
There is no dependable gallon count for every RV. Use the exact winterization procedure and account for the number of water branches and optional appliances. Automotive engine coolant is not suitable for drinking-water plumbing.
| Before adding product | Find in your RV manual | Record |
|---|---|---|
| Water heater | Storage or on-demand type, drain and bypass procedure. | Valve position and whether the heater was drained. |
| Water branches | Hot/cold fixtures, outside shower, toilet, ice maker, washer, and low-point drains. | Each completed outlet or component. |
| Product | Plumbing-compatible antifreeze and maker instructions. | Brand, amount used, and spring flushing steps. |
Keep this record: Keep the exact product container information and a fixture-by-fixture completion record for spring restart.
Use a product labeled for RV potable-water plumbing
RV plumbing antifreeze is sold for winterizing specified fresh-water systems. Automotive engine coolant is a different product and must not be put into drinking-water plumbing. Read the product label and your RV manual before use.
A “non-toxic” label does not replace the spring flushing and sanitizing instructions for your RV. Keep the container and label for the exact product you used.
Map the system before adding anything
Find the fresh tank, pump winterizing inlet if installed, low-point drains, filters, faucets, toilet, outside shower, and water heater. Check for appliances with their own winterization steps, such as a washer, ice maker, or on-demand heater.
Many RVs bypass and drain a storage water heater before drawing antifreeze through the lines. The correct valve arrangement depends on your model. Do not assume antifreeze belongs in the heater tank.
How much antifreeze is needed?
There is no reliable gallon count for every RV. Plumbing length, number of fixtures, optional appliances, and whether you are winterizing with compressed air or a pump inlet all matter. Use the quantity in your owner procedure, then have enough additional product to reach each specified fixture.
Do not stop merely because one faucet has changed color if the manual lists additional branches or drains. Keep a written checklist of outlets completed.
Avoid contamination and missed water
Follow the product and RV instructions for filters, water-heater bypasses, drains, and traps. Do not mix chemicals or pour automotive coolant into the plumbing. Never pressurize the system beyond its specifications.
If freezing has already occurred or a line is damaged, adding antifreeze does not repair it. Arrange inspection before putting the system back into service.
Return the system to use in spring
Use your RV’s dewinterizing instructions to flush the plumbing, return bypass valves to operating positions, refill the water heater correctly, inspect for leaks, and sanitize the fresh-water system where directed. Do not energize an empty electric water heater.
Record the antifreeze brand and the date of winterization so the spring procedure starts with accurate information.
Manufacturer manuals & further reading
Use these official resources to find details for your equipment. Match the brand, model, and revision; another RV’s procedure may not apply to yours.
- Winnebago operator manuals
Find Winnebago manuals by model year. Match the model and serial-number range before using a schedule, plumbing layout, or storage procedure.
- Jayco owner support and manuals
A starting point for Jayco owner manuals and product support. Use the manual for your RV and the separate instructions for its installed appliances.
This guide is general educational information, not a substitute for your RV’s manuals or professional inspection.