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Cars & Vehicles
Antifreeze and Engine Coolant
Radiators

When do you add coolant with the car started or not?


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Answered 2007-01-10 20:03:51

You should add coolant with the engine off and cool, top off the radiator and fill the coolant reservoir to the cool or cold level. When the system is hot or running it will be pressurized and will be dangerous to open. You can however add coolant to the overflow reservoir at any time.

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