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At speed, the engine is working harder and as such generates more heat. If the cooling system is not functioning properly, the engine will run hotter. Recognize, however, that the engine may just be running very cool when you drive around town, and it just gets up to the thermostat set-point when it's working hard. If it's not overheating, you're probably ok. If you have any doubts, change the thermostat. But whatever you do, don't run the engine if you are loosing coolant. That particular problem has to be resolved quickly, before you cause serious damage to the engine.

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2006-04-03 15:14:10
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Q: Your 1995 Chev S10 Blazer runs hot when diving on Highway 60 to 70 miles hour but not when driving around town stopping and starting just started this week only changes had new tires put on?
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