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On older cars / trucks that do not have a coolant recovery tank you should fill the radiator to approximately one inch below the opening. ( when the engine is COLD } On more modern cars / trucks that have a coolant recovery tank, the radiator should be completely filled and the recovery tank should be filled to the full cold mark. You should only do this when the engine is cold to avoid personal injury. Why is the cooling system low? A pressure test should be performed and all leaks repaired.

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17y ago
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Q: How do you tell if you've overfilled your radiator and what are the consequences of doing so?
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