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If it's boiling..then it has a stuck thermostat and needs to be replaced. I would would replace it with a new one.

Also..

Change the Coolant temperature sending switch (brass lookin nut with wires going to it near thermostat housing).. this controls the on/off function of the electric fan attached to the radiator..

Further.. if changing the thermostat and switch doesn't work.. hook the electric fan to a 12 volt source (ie hook up to the battery) fan should turn on/off when it gets 12v

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12y ago
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Q: Why is the coolant boiling in your 98 dodge grand caravan?
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