ALWAYS check BOTH the radiator coolant level and the level in the bottle when the motor is COLD. Coolant level in the radiator, COLD motor, should be up in the neck of the radiator.....if not, you could have a bad radiator pressure cap. The radiator pressure cap has 3 sealing surfaces and 2 coolant passages. All 5 components must be working perfectly. Radiator caps are inexpensive to replace. Coolant level in the bottle, COLD motor, should be at, or slightly above, the MIN/COLD mark on the side of the bottle.
Wrong - you don't take the cap off a closed system. You check at the reserve tank. With this system the radiator is always 100% full if there is fluid in the tank. Every time you open the cap you lose fluid.
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