Batteries: Get your battery tested prior to cold weather to be sure you have one that lasts all winter. If your battery tests poorly, consider getting a new one right away.
Belts and Hoses: Do a visual inspection of your belts and hoses. Look for cracks or torn edges. If you see damage, replace them as soon as possible, because a broken belt or hose can bring your truck to a standstill.
Coolant: Your coolant mixture should be a 50/50 mix of water and antifreeze. If the mixture is off, the fluid can freeze potentially causing leaks damaging the engine block.
Thermostats: If your truck takes a long time to warm up, the thermostat may be failing. Be sure to check this or have it checked, especially if you have an older truck.
Glow Plug: The purpose of a glow plug is to heat the combustion chamber for cold starts. A failing engine glow plug will keep your truck from starting. Check for, and replace faulty plugs at the first sign of colder weather.
Engine Oil: Switching to a cold weather oil (many recommend 5W-40) will reduce wear on your truck from oil thickening.
Fuel Filtration: Winter additives can be used to keep fuel from clogging and damaging your filtration system.
Tires: Inspect for bubbles, cuts or other damage. Winter tires give you added protection and traction on icy or wet roads.
Upgrades: Engine block heaters reduce engine wear, making winter driving easier, and help with cold starts.
Emergency kit: It’s always a good idea to keep some emergency supplies on board, especially if you are driving in the snow. Hopefully you never have to use them!