WATER SYSTEM
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THOR MOTOR COACH | MADE TO FIT
2. Remove or by-pass the potable (drinking) water lter
(if equipped).
3. Disconnect and cap (or by-pass) the:
› Refrigerator ice maker inlet water line (if equipped);
› Dishwasher inlet line (if equipped);
› Clothes washer inlet line (if equipped);
› If the motorhome has a dishwasher, ice maker,
or clothes washer, follow the appropriate appliance
manufacturer’s instructions pertaining to winterizing
(and de-winterizing).
4. Turn OFF all water heater power switches. Some water
heaters have both 12-volt DC and 120-volt AC heating
elements.
5. Turn OFF the gas valve at the water heater or turn o
the power to tank-less water heater (if equipped).
6. Turn the water heater bypass valves (if equipped) to
the BYPASS or WINTERIZE position. Tank-less water
heater installations may not include bypass valves.
NOTE: DO NOT allow antifreeze to enter the water
heater; it can damage water heater components
7. Drain the water heater tank. CAUTION: water may
be HOT.
8. Close the freshwater holding tank drain valve and both
low point drains valves.
9. Attach a short length of water hose to the city water ll
(6 to 8 foot) and insert the other end of the hose into a
gallon container of RV antifreeze (this quantity should
be enough to winterize the motorhome). To assist the
siphoning process, place the container on an object so
that it is approximately two feet above ground level.
10. Turn the water pump ON. If the water pump fails to self-
prime, temporarily open the low point drains. Close the
low point drains as soon as the water pump primes (RV
antifreeze will begin draining out), and before continuing
to the next step.
11. Open hot water faucets one at a time, beginning with
the faucet furthest away from the water pump, until RV
antifreeze begins to steadily ow out (kitchen, lavatory,
shower, clothes washer, exterior shower and spray ports).
en, close the faucet. Repeat for each hot water faucet.
12. Perform the previous step with all interior and exterior
cold water faucets and spray ports.
NOTE: Allow enough antifreeze to ow so that the drain
traps are lled with antifreeze.
13. Pour a cup-full of antifreeze down the shower drain.
14. Flush the toilet a few times until antifreeze appears in
the bowl.
When adding RV antifreeze is finished:
15. Remove the hose from the city water ll port.
16. To prevent staining, wipe the RV antifreeze out of the
sinks, shower, and toilet using a so, dry cloth.
De-Winterizing the Motorhome
1. Drain the holding tanks (fresh, gray, and wastewater
tanks).
NOTE: If you do not have access to a sewage inlet, only
drain the fresh and gray holding tanks. DO NOT drain
the black holding tank onto the ground.
2. Open the low point drain valves and drain the water
lines of antifreeze. Opening a hot and cold faucet will
help drain the water lines more eectively.
3. Close the low point drain valves and all holding tank
drain valves.
4. Attach a potable water hose to the freshwater ll inlet
and ll the freshwater holding tank.
5. Turn ON the water pump switch and open the cold
water side of all faucets and shower xtures. Shut OFF
the faucet and shower xtures aer the water runs clear
(no pink residue) and repeat for the hot water side.
6. Flush the toilet until clear water runs into bowl.
7. Empty the holding tanks again.
8. Sanitize the freshwater system.
9. If a potable (drinking) water lter has been installed:
drain the water lines, remove the assembly, clean and
reinstall using a new potable (drinking) water filter
cartridge.
10. When ready to use the water heater, open the bypass
valve allow water to enter and ll the water heater tank.
NOTE: e water heater bypass valve must NOT be in
the BYPASS position for normal water heater operation.
NOTE: Although RV antifreeze is biodegradable, con-
sider using a catch basin under the low point drain and
freshwater holding tank outlets to collect and properly
dispose of used antifreeze solution.
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