Hi,
Your vehicle came with GM Dex-cool engine coolant. Do not mix green coolant with it. He is correct. If the coolant is original (Dex-cool) you need to use the same type. There are other brands that are a universal type and different in color. However, if you are not sure which to get, just stay with the original type.
The only other concern that I have is if the coolant is still Dex-cool that is in the vehicle. Based on your description, it sounds like it is. However, not being there makes it hard for me to confirm.
Take a look through this link. The second paragraph discusses manufacturer specific coolant.
https://www.2carpros.com/articles/engine-coolant-59420607
Let me know if you have questions or need help.
Take care,
Joe
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Monday, March 9th, 2020 AT 7:50 PM