Make sure your tires are good. If there is uneven wear on the treads, you should have your alignment checked by a professional. If you have a slow leak, have the tire patched before the winter. Having good traction is essential during the snowy months. Make sure your coolant system is working efficiently.
Cars overheat in the winter as well as the summer.
Make sure the fluid level is high and check your temperature gauge to be sure the engine is at a normal temperature. Make sure your fuel system is clean. Pour some dry gas into the gas tank to displace the water to prevent any freezing. Be sure that your car is tuned up before the winter. This will prevent any minor problems from occurring and leaving you in the cold.