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Your coolant level might be low. Your water pump my be broken. Your radiator pipes/buckets might be leaking.

It's possible for the radiator itself to be plugged up. It's usually better to replace it with a new one than have the old one re-cored.

Also, while you're doing that you might want to go ahead and change the thermostat.

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Q: What cause a car to overheat when it's being driven down the road at 55 mph?
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