Hi:
Put it in the resevoir to the full mark and then check it again after running the car to see if more is needed. Please keep in mind that many GM's during that time period used Dex Cool. It is pinkish orange color coolant. It should say it on the tank lid or near there. If it has that, you CAN NOT add regular green coolant. Use Dex Cool or a general GO5 universal coolant to refill.
Let me know if you have any questions.
Joe
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Sunday, December 14th, 2008 AT 12:59 PM