We often take great care to make sure that our homes are ready for winter. But the same needs apply to our cars, too. One part of the car that we often overlook in the winter is the radiator. In cold temperatures, coolant in the radiator freezes and expands. This can cause stress on the radiator that leads to cracks. Cracks can then cause leaks that damage the car's transmission. Damage to the radiator can cause a ripple effect through the car and make the car stop running completely. It's important to maintain the car while the weather is warm in order to keep the car happy all year long.