Janet,
A bad thermostat won't cause a loss of coolant. If you need to add it and there is steam coming from the radiator, chances are that is the problem. If the radiator is leaking between the tanks, it can be fixed. If it is leaking from or where the tanks join the radiator, you will need a new one.
LEt me know if you have other questions, let me know and thanks for using 2carpros. Com.
Joe
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Thursday, December 17th, 2009 AT 5:18 PM