Essential items to inspect

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Radiator - Make sure proper winter coolant is installed and that there are no leaks.
Tires - Make certain all tires have good tread.
Wipers - Be sure your wiper blades are in good condition, so they will sweep snow and sleet off, rather than slide over it.
Heater and defroster - Make sure the heater and defroster are functioning well enough to keep the windshield clear at all times.
Lights - Be sure both headlights work on upper and lower beams and are correctly adjusted; also that brake, tail, marker, clearance lights and directional signals work properly and are clean, so they are clearly visible to other drivers.
Brakes - As roads become slippery, it's necessary that the brakes be in the best condition and balanced for uniform braking. This is even more critical with trains or doubles operations.
Muffler and exhaust system - These should be in good condition and tightly fitted so carbon monoxide does not seep into the interior of the vehicle where it could cause serious illness or death to the driver or occupants.
Battery - Cold weather greatly lowers battery power. Make sure yours is in good condition, and in case it's necessary, know the proper procedure for using a battery booster.
Fifth-wheel lubrication - For tractor trailer combinations, make sure a winter grade of lubricant is used on the fifth-wheel. Some heavy summer grades of lubricant at low temperatures become too heavy and interfere with steering on slippery surfaces.
Windows and mirrors - Make sure that windows are clean to ensure good visibility. Mirrors should also be kept adjusted and clean for good visibility to the rear.