History

• Before the advent of computerized engine controls, such as the electronic control module, drivers often installed cooler temperature thermostats to maintain comfortable temperature levels in the vehicle cabin during hot summer months. Drivers then installed warmer temperature thermostats in the fall to ensure warmer cabin air in colder months. As of 2011, modern engine controls require a moderate temperature of approximately 195 degrees Fahrenheit to function effectively, rendering lower temperature thermostats unnecessary.
  
  

Benefits

• Lower temperature thermostats open sooner, thus enabling coolant to circulate more quickly and keeping engine temperatures lower. In older model cars not regulated by computerized engine controls, lower temperature thermostats reduced the demand on the cooling system, thus decreasing the likelihood of overheating during times of heavy engine load, such as towing.
  
  

Warning

• Modern vehicles are programmed to work with a thermostat with a temperature rating for that automobile. Replacing it with one rated at a cooler temperature can cause issues with the fuel and spark control systems, resulting in poorer engine performance and fuel economy.