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Thermostat questions

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Numero9:
Got all the symptoms of a stuck open thermostat so plan to change it this coming weekend however watching a few videos I've confused myself any need some help clarifying a few things

1) is it right that in later GTi (mines 08) there is more in line stat and only the main one to replace?
2) seems to be 2 options remove intake or remove alternative, is there a preferred method from those who have done it themselves?
3) watching one video there was a comment about also changing the o-ring on another pipe but I can't remember which video said it or where the o-ring was, does anybody have a diagram for where and possibly a part number?

I know it'll be a pit.of a.job but I have a full day set aside to oil change, coolant flush and this and quite looking forward to it...

mjmallia:
It all depends on the gearbox you have to my knowledge.

Manuals have one near the alternator.  This is for the Turbo and prone to failing like mine did, as it stuck open and never go to temperature...........fine now.

The second/additional one is for people who have DSG, and that sits above the box and works for the box

Numero9:
Sorry should have said its a manual 08. From what I read the DSG and 3 and the manual has 2 but also ready the inline was deleted so a later GTi should only have 1

pudding:
Have a look in the engine bay to determine it for yourself.  As stated, the thermostat count varies with model year and gearbox type.  My manual 07 has 1 thermostat.

Removing the alternator is the best method.  It's dead easy once that is out of the way.

LC5F:
The whole "3 thermostat" thing was just on early cars - as Pudding said - check how many inline ones you have -if any. not cheap, over £40 each a few years ago. As an example my 2006 DSG has a single inline.

If you are changing the main thermostat, consider doing the coolant temperature sensor at the same time, as it is mounted within the thermostat housing - sods-law guarantees it to fail within 6 months if you don't change it!

Alternator off is the best way forward, but tight if you have large hands, making the whole job awkward - I have not seen inlet manifold off as a suggested route - it would be a $ite ton more work and has the potential to create more problems.

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