Buick Repair Questions? Ask a Mechanic for Answers ASAP
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Has the thermostat been replaced?
I see, thanks.
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It is very likely that the thermostat is not closing or not closing all the way when it should. As the air runs through the front grille and through the radiator it gets cooled down as you drive. With a bad, (or lazy) thermostat the coolant doesn't get up to the proper temperature.