how bad is it if orange/green may have been mixed? apparently the "add coolant" light came on for my father's '02 deville recently, so he threw some 50/50 coolant in there. And the light has still been coming on, think its been going on/off. I know the bottle that was laying around didn't have much, hopefully he didn't add more than that. guess its possible the previous owner(s) changed to regular stuff anyway.
I don't know what coolant type is in my '97 eldorado, but it looks like it could use some more, regardless im just going to flush it and add the green stuff. there is a sticker saying that a leak detection dye was added in 2004, don't know if that makes a difference.
so whats the process here? i've heard things such as keeping it simple, just let everything drain as normal (no spraying with garden hose, detach hoses, etc. although this is probably strictly for flushing, not changing from dexcool to green, right?) to flushing with distilled water, adding pellets, using some kind of powder on the hoses and all that jazz. and should a different process be used on the '02 deville than my '97 eldorado, since it's a lot more likely two different antifreezes have been mixed?