A common difficulty with internal combustion engines in the summer is overheating. Motors heat up from load, traffic jams, poor quality fuel, antifreeze and many other things. To know exactly what the coolant temperature in the radiator is in case of a breakdown, use a cap with a thermometer. The sensor scale is marked up to 200 degrees, with a red zone from 80. You can choose a cap with the required pressure level - 0.9, 1.1 and 1.3 bar.