What is the purpose of the 2nd round against one who goes to the radiator cap on the reservoir of coolant?
Toyota 2008 Highlander ... There are two pipes of the tank cap coolant, one that goes to the radiator cap ... and the second which is opposite the first .. just want to know what's the second pipe?
I believe that we overflow / vent. If the tank is too full, it empties on the ground, rather than having to pressurize the tank and overflow and the explosion and make a huge mess. It also vents the tank to prevent it from becoming pressurized that the level of coolant fluctuates.
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