Thread: 9-5 Aero, what is the right antifreeze? Blue or Red?

Some of the red antifreeze I've used in the past was methanol based and gave off some strange fumes. I think it's banned now! I'm not sure what you have in your car. It may have been changed in the 9 years, but if original, it is the right colour. I would just buy some that is GM compatible. Maybe cheaper from a Vauxhall dealer than a Saab one?

I bought the proper GM Antifreeze from my local Vauxhall dealer and it is a pinkish colour which matched what was in the header tank already so I assume as my car has a FSSH that this is the correct antifreeze to use.

The best anti-freeze/inhibitor only lasts 5 years 150KKm, if you believe the marketing. If the expansion tank is grubby & the coolant is discoloured then replace it. The head gasket history of 9000 does not show the original coolant inhibitor to be much good, quite the opposite. I don't want to go down that path again. I flushed the old reddish stuff completely out & cleaned the expansion tank. I have heard that the red...

Did you suck up some of the coolant and see if there was any noticeable colour when decanted into a clear glass jar? Why not drain all the old and refill with your choice of a/f colour and distilled water? It's not a difficult job to do, and you could flush the system if you're worried about traces of teh old stuff remaining in the various pipes.. Geez

Have done a search on this and couldn't find a definitive answer..... As the chilly season approaches, I want to top up the antifreeze in my 9-5 Aero (Jan 2000 registered). I know blue and green antifreeze will mix together but not with red antifreeze and that blue/green uses silicate/phosphate/borate corrosion inhibitors and red uses organic acid corrosion inhibitors hence why they wont mix. How do I know which is the right stuff to put...