Changing the engine coolant on a 1999 32 v NorthStar V8 in a Cadillac Deville

[@jameswhite1319]

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[@user-nl7lr7xg9k]

Should you use orange dex cool coolant?

[@nevadarobert7908]

Excellent question. Coolant color is no longer as useful as it used to be. IAT, OAT, HOAT (if memory serves me right). I try to use the universal coolant. Hope this helps.
HOAT means Hybrid Organic Acid Technology, or Hybrid OAT. This coolant type is a combination of OAT (Organic Acid Technology) and IAT (Inorganic Acid Technology). While it is normally yellow in color, you can also find it in purple, blue, pink or turquoise.

[@killian611]

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