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Well, there are two place is can go. In the radiator and the reservoir. The radiator is the big black thing in the very front of the engine area. It usually has a silver cap. DO NOT OPEN THIS CAP WHEN VEHICLE IS HOT OR OVERHEATING, DANGEROUS...it says that on the cap too. If you are not good with pouring, then get a spout and put it into the radiator after you open it and pour the coolant in slowly. Watch for it to rise so as not to overfill. You also put the coolant in the reservoir this is usually a white plasitci container on one side of the fender area that says, coolant only. You can put water in there but far less effective than coolant. Do the same thing with the spout if needed and only fill to the lind indicated on reservoir.

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Q: How do you add engine coolant to a 1999 Pontiac Grand Prix?
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