Coolant loss can be potentionally a dangerous thing if it goes unattended. It can come from over filling the coolant system, overheating the engine and pressure forces it out, internal and external leaking (check our other FAQ on these two subjects), or a faulty radiator cap. If you have problems with the radiator cap most of the times is because the recommended pressure for your car is less then what the cap is made for. Always be sure to get the right cap for your car to avoid any problems with coolant loss or overheating. Always fill your coolant resivoir to what your car is made to handle, don't over fill this thinking it will last longer because you will get the exact opposite reaction.
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