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2999 Old Hardin Rd.
Billings, MT 59101
(406) 248-7481
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Boise's 5th Wheel Headquarters
4180 Broadway
Boise, ID 83705
(208) 388-4678
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Missoula, MT
4800 Grant Creek Rd.
Missoula, MT 59808
(406) 541-4800
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1608 Industrial Road
Nampa, ID 83687
(208) 606-7160
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Winterize your RV

Winterizing your RV can be a simple process, if you just follow the steps below.

BEST METHOD: Bring your unit to Bretz RV & Marine and let us do it for you.

We guarantee our work.

  1. Drain fresh water tank.
  2. Drain hot water heater.
  3. Dump and flush both black and gray water holding tanks, leave gray water valve open.
  4. Screw compressed air adapter into the fresh water inlet. The adapter is available from Bretz RV & Marine
  5. Apply compressed air, keeping the pressure less than 20 lbs/sq inch.
  6. Open each faucet, one valve at a time, allowing the compressed air to force the water out of the line. Don't forget the shower and toilet.
  7. Remove the drain plug from the hot water tank and allow the compressed air to blow out the remaining water. Reinstall drain plug.
  8. Remove the compressed air source and adapter.
  9. Close the water heater by-pass valve. (SEE SPECIAL WATER HEATER NOTE BELOW)
  10. Remove the water line that runs between the fresh water pump and the fresh water tank, where it joins the fresh water tank.
  11. Insert the end of the line into a gallon jug of RV antifreeze. (NEVER-NEVER-NEVER USE AUTOMOTIVE ANTIFREEZE!!!!!!!).
  12. Start the fresh water pump. It will run for a few moments, sucking antifreeze from the jug. It will stop as pressure in the system builds up.
  13. Open each valve of each faucet, one at a time, until the red antifreeze appears, shut the faucet. Don't forget the shower and toilet.13a. Be sure to winterize all other systems that water flows through ie: Ice Maker, Hot Water Floor heat, Water filter
  14. Remove the line from the jug of antifreeze and reattach it to the fresh water tank. HINT: For a few dollars you can buy and install an adapter that will eliminate removing and reinstalling the fresh water line. It is a small three way valve that goes in the fresh water line, between the fresh water tank and the pump. You can easily pump antifreeze throughout he system by inserting the tube attached to the valve into a gallon of antifreeze, turning the valve and starting the pump. Simply turn the valve back to its original position and you are done.
  15. Shut the gray water valve.
  16. Pour a few cups of antifreeze down each drain and the toilet.16a. Check sealants on the unit. Check for roof water leaks and possible window or slideout leaks.
  17. You're done.

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