Check battery twice a year: Heat degrades a battery’s interior components and shortens its life. Depending on the demands of the vehicle electrical system and driving habits, prolonged heat can be harder on a battery than cold.
Maintain engine cooling system: Cooling systems work extra hard during hot weather. Coolant protects the radiator and internal engine components but degrades over time and needs to be changed. Rubber cooling system components will also deteriorate in extreme heat so inspect hoses and drive belts for cracking, bulges, soft spots or other signs of poor condition.
Top off fluids: Most fluids not only lubricate, but also serve as coolants by carrying heat away from critical engine components and when fluid levels are low, this cooling effect is reduced, increasing the probability of overheating. Keep up on routine oil changes, as reputable shops will also inspect other fluid levels when changing the oil.
Check tire pressure and condition monthly: Changes in temperature can affect tire pressure, which can cause uneven wear and shorten the life of a tire.
-Source: AAA