BMW 3-Series Radiator Caps

While operating, the engine produces a great amount of heat which can be destructive for the engine itself and other underhood components. For this reason, vehicles are equipped with radiators that help to cool the engine down. Engine coolant found inside the radiator should operate under the required amount of pressure. It is the task of a radiator cap to act as a pressure valve. Another function of a radiator cap is to direct some hot coolant to the overflow reservoir and once the acceptable levels of pressure have been reached, to draw it back, thus preventing extra pressure buildup in the system.

The BMW 3-Series manufactured in the 80s had problems with excessive pressure in the cooling system. The pressure was so intense that it could damage the heater core and let hot coolant in the cabin, splashing it right on the driver's feet. A different radiator cap and pressure relief valve solved the problem in recalled vehicles. Coolant leak (a problem area fairly common for 3ers) is the first sign of a failing radiator cap. To make sure that it is the cap’s failure, check the pressure inside the radiator – if it is different from normal, get ready to replace the cap. Here you can find top-notch BMW 3-Series replacement radiator caps to restore the cooling system.