Check coolant level in coolant recovery tank and radiator
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The 2004 Chevrolet Malibu coolant sensor float is located in the
radiator. The coolant sensor float replace the level of coolant to
the instrument panel.
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12 quarts coolant
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The coolant capacity for a Vectra is approximately 7.2 liters.
That would be roughly 1.9 gallons of Vectra coolant capacity.
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The coolant is water mixed with antifreeze (35-50%).