hello mate.
I just removed the engine out of a mk2 today so got you some pics. everyone has their own way of doing things i just unbolt as much as i can

If the 1.6 is anything like the 1.8 8v gti then..
unbolt and remove the long bolt

loosen/unbolt this. Tentioner?

remove this bolt

Get the belt off.
There might be a few other bolts you need to remove but i cant remember. should come off and give you access to the thermostat housing.
I cable tie the PAS pump out of the way.
Dont overtighten the housing...will crack!
might want a new O ring too.