• Thermostat stuck closed? And probably a million other things...
  • It's probably time to add a can of radiator sealant. The radiators develop those rust pin holes just like drainpipes do on houses. You may try the sealant and check your car's temp after you run it a little bit. If it doesn't run cooler, there may be a more serious problem causing the overheating. Good Luck!

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