That's not too common, but does happen. The usual Valeo combi radiator / transmission cooler at cause here.
More importantly, you should avoid these things like the plague anyway. Vauxhall take a perfectly good Aisin-Warner 'box, with its manufacturer recommended biannual fluid changes, add snake oil and say it's sealed for life. If its previous owners stuck to Vauxhall's recommended servicing and didn't get the fluid changed regularly, the box's internal filter will be stuffed and the clutch banners on the way out by now.
Having said that, they do seem to go on for some time while slipping like billy-ho...
An update.
I have also recommended a gearbox oil change,
Said Vauxhall dealer supplied a newer 2.2i auto Zafira, and when my friend checked the service book, found that service not done before delivery and various minor faults not cured. Excuse was that car had been serviced by the previous owner many months earlier, and eventually was done, but no documentation supplied for this.
Will be having words this morning!
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