Cut Off The Power Supply Before Working On The Cooler
You do not need the power on to winterized the unit and it is always safe practice to disconnect any power source before working or repairing any appliance.
Turn Off The Valve Supplying Water
The water line must also be drained to prevent freezing during the winter. This can be done by disconnecting the water line at the supply valve and the cooler. If the water line does not slope in one way the water will not drain by itself. If that is the case, go to the highest end and blow through the line to force the water out of the line.
Drain The Cooler
The pan should be drained every fall and the drain left open to allow rain water to escape. After draining you will find dirt and mineral sediment in the bottom of the pan. This should be cleaned out. Using a shop vacuum works well for removing the dirt and minerals.
Change The Cooler Parts
Many people think of doing this in the spring when starting the cooler. The pads are pressed against the metal louvers and can speed up the rusting all throughout the winter. With fresh new pads installed in the fall, you will keep the louvers from rusting all throughout the winter.
Remove The Fan Belt
This step is constantly missed by homeowners. Especially for people in colder climates. With freezing or sub freezing temperatures, this can cause belts to crack/break. Belts are typically cheap to buy, but if you can take two seconds and remove the belt during the winterizing process, it's one less thing to worry about when spring or summer comes back around.
Install A Cooler Cover
It stops the outside air from entering the home or building. Most home coolers have a damper that can be closed that will prevent most of the air from entering the ducts and getting into the building. A cover is especially needed if you do not have this damper or if the damper is not tight enough.
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