My Mk1 Gti Cabriolet has at some point had a bodged repair on the thermostat housing.
Took it off 2 days ago, cleaned all the silicone sealant out, replaced the thermostat, couldn't get an 'o' ring either side of the housing and tighten up the cap!!!
So I bodged it back up again by using sealant to hold the thermostat in and an 'o' ring to seal the cap!!
Did it work?
NO!!!!
Its now worse than ever, so I have come to the conclusion I need a new Water Pump.
How easy are they to fit and in what order shall I do it all?

?
(1.8 injected engine by the way)