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Overfilling a coolant reservoir.......isn't possible since they have an overflow line.... Water is cycled back and forth as needed... with movement of water, air in the top of the reservoir is obviously necessary, since overfilling the reservoir would cause the overall cooling system to fail to do its' job!....... In otherwords, If you try to overfill the coolant reservoir tank, it shoud automatically start draining the excess water/coolant onto the ground. The other reason for the overflow is to protect from high pressure in times of high temperatures..... steam and water can both escape this way. Chris... c-tekk@hotmail.com

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Q: Is overfilling coolant resorvior bad
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