Most RV dealers offer free winterization classes.
1. Open the low point drains and drain as much water out of the lines. Replace the caps.
2. Turn the bypass valve on the back of the hot water heater and then remove the water heater drain plug. Suggest using a hand held suction pump to draw out remaining water in the bottom of the tank.
3. Using an air compressor and a nipple attachment on the city water port (available just about anywhere that sells RV supplies) blow out the lines. Start at the point highest/farthest away. It helps to have someone assist with this. Keep the air pressure around 40 psi. Alternate hot and cold for each fixture and don't forget the toilet. Last step is to open the low point and blow the rest of the water out.
4. Install a winterization kit/bypass valve on the input side of your water pump. Alternative is to use a hand pump connected through the city water port.
5. Depending on your trailer, you'll need about 3 gallons of anti-freeze. Insert the draw tube from either the winterization kit or from the hand pump into the first gallon of anti-freeze. Flip on the pump and let it draw the fluid into the system. Again, it helps to have help.
6. Go to each fixture, again highest/farthest and alternate between the hot and cold until it you get anti-freeze. Don't forget the toilet, shower, and outside shower, etc. I try to collect the fluid in an empty jug. Obviously, you'll need to replace the bottles as they empty. I also use a screwdriver to carefully push open the city water port. The last step is to open each low point until anti-freeze comes out. Close everyone up and your done.
7. Now take any left over anti-freeze, e.g. what I collected in the extra bottles and pour it into each sink trap and enough down the drain to put about 1/4 to 1/2 gallon in the grey and black tanks. I'll also briefly open the black and grey water waste valves to get some anti-freeze in there too. Don't forget the galley tank if equipped.
Some folks just pour antifreeze into the fresh water tank and suck it out...but IMO that's using too much chemical and requires a lot more effort to flush out.
I think I hit on everything...I'm sure others will chime in if I missed a step or give you some other ways to winterize using anti-freeze.
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J. B. Smith
Dayton, OH
2012 Keystone Cougar 331MKS
2018 RAM 3500 Laramie 6.7L DRW
B&W Companion
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