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I had this problem with my 97'. You should check the oil make sure it hasn't turned to what looks like chocolate milk yet, if it has you might as well start looking for a new car. Replace the thermostat they are not expensive. If these things fail it could also be your head gasket or the head. If it is the head you are looking at $2,000 for repair. but if it is just the head, you might have a chance like I did. Luckily mine was a pinched line. Also check your lines. But a over heating problem is also hard to find.

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15y ago
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Q: Your Pontiac Sunfire 98 overheating what to do?
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