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Coolant Light is on even when its to the full line, not overheating but i am loosing coolant overnight and have to replace it

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You say "when it's to the full line". If you are referring to the plastic coolant reservoir, that is not an indication of how much coolant is in the radiator. You must remove the radiator cap to check the coolant level and too add coolant. If you are pouring coolant into the reservoir, and the radiator is low, then the coolant in the reservoir is probably being pulled into the radiator after you have driven the vehicle. That doesn't mean you are losing antifreeze. It just means you need to put antifreeze in the radiator.

Posted on Jan 02, 2011

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