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Dear Karen, First of all, you should always use a 50/50 mix of water/antifreeze for your cooling system. Water has a much lower boiling point and could overheat faster. As for the thermostat being bad, that could certainly cause your vehicle to overheat. If the thermostat stays closed then the coolant is never allowed to circulate into the radiator to cool down and the vehicle may overheat. The therostat is definitely a possiblity. Lori Johnson

⟩ Answered on May 10th, 2007 by Lori Johnson, Owner and Instructor at Ladies Start Your Engines

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