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Thanks! Checked the tank and the hoses have definitley been inverted and the tank part number can be seen as 12842086, 4, so assuming it was done, possibly before original sale (2009).

Looks like...

Cyberspun, just to confirm, you were losing coolant from the overflow after stopping? or the expansion tank welds?

If the first, the new tank solved your problem?

Thanks all. Re. ECM, yes fan coming on and off fine after stopping, so doesn't seem to be issue with ECM.

Will have another look at the expansion tank, looks fine from what I can see, but guess...

Firstly, an apology. I'm sure that this is answered somewhere, but I can't find it through the search engine.

I have a 2009, 9-3, 2.8 V6 convertible. Have had it for all of 2 months (first Saab)...