MikeTheThinker

A mathematical teaser ...

"Vin Flinger". Now there's a name for an adventure film hero

You need to know your engine code to match the correct cooling system. If you don't have the service book to hand look in the spare wheel space for the configuration sticker.

Would this most likely be accompanied by screeching or squealing due to bearing failure?

TFTD Sunday: “A good rule to remember for life is that when it comes to plastic surgery and sushi, never be attracted by a bargain.” — Graham Norton

I hope said partner is OK, and that you don't have to tackle any adrenalin leakages within the vehicle?

I can't speak from experience of working on the mechanics (although I have my second O2 4x4) but the parts catalogue page for gearboxes for a 2009 O2 is HERE, and a little navigation will lead you to the other catalogue pages for the rest of the vehicle. From my understanding the 4-wheel drive system is triggered by monitoring the front wheels for slippage via the ABS system, in which case you would need to be looking at wheel sensors, ABS controller, plus wiring. I suspect there will be a 4x4 controller but I haven't looked. I know there are others on the forum who have converted mk1 Octys to 4wd so those posts may be helpful starting points.

Always read the label ...

TFTD Saturday: By working faithfully eight hours a day you may eventually get to be boss and work twelve hours a day - Robert Frost

Rodent retailing ... PG [mildly suggestive]

TFTD Friday: Horse sense is the thing a horse has which keeps it from betting on people - W.C. Fields

The parts catalogue page for the front door locks is HERE. The main body of the lock is item 1.

TFTD Thursday: Parents were invented to make children happy by giving them something to ignore - Ogden Nash

Some (possibly questionable) ailurophile bling ...

TFTD Wednesday: It pays to be obvious, especially if you have a reputation for subtlety.- Isaac Asimov