As soon as stem of thermometer approaches to a dangerous line, you need to include the heat exchanger and open all the windows. The temperature in the cabin will be like in a bathhouse. On the other hand the engine won't overheat. At the same time you will realize that in summer it's need to pour the antifreeze in the radiator instead of distilled water.
You can avoid the engine overheating in summer in the old-fashioned way.
06 / 17 / 2016