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It could be that your fans are not turning on when the temperature is going up, when you car starts to heat up check and see if both the upper and lower hose are warm or hot. If only the upper hose is hot and the lower is considerably cooler you have a coolant circulation problem. this could be because of air in the system or a bad water pump. if it is the water pump you will hear it making noises. best of luck.
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