Hi amen8462. Welcome to the forum. The coolant will expand a lot when it gets hot. That's why there is an overflow reservoir. That's where you should be checking the level. The radiator cap keeps the system sealed and maintains up to 15 pounds of pressure on it. That increases the boiling point of the water to 256 degrees. If you want to verify the coolant is circulating, feel the temperature of the upper radiator hose near the radiator, not near the engine. Also check the air temperature from the heater. If it is hot, coolant is circulating.
Caradiodoc
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Friday, May 28th, 2010 AT 11:47 AM