Question about 1994 Buick Century

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I can hear the cooling fan kick on, but Temp gauge needle stays on last White mark before Red, while driving at 65 mph, if I drive at 70, then it briefly enters Red, and I see a warning dash light briefly. If I let off the gas, and coast for a bit, Temp gauge needle drops a bit, if car sits idle, needle stays in Middle. Compared to my mother's car, my Temp gauge seems to raise a bit faster than hers, mine sits near Hot, before her car could reach Middle in same time/distance. *Replaced Thermostat couple months ago, and all fluids at a shop. *Took car to local shop, they connected to computer, and it showed that cooling system was kicking on at normal Temp range. *Mechanic couldn't find anything wrong, and I explained to him about this only happening on the highway, but he said he was limited to what he could do, without replacing parts that were already good, because problem wasn't clear.

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I would look for debris around the thermostat or maybe flush and fill the coolant system to try to make it work more efficiently.

Posted on Oct 12, 2010

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