for the coolant, how long since last changed? it'll lose the anti-freeze and definately the anti-corrosion properties over time. Not sure with Alfa's about steel pipes in the coolant path, but on some Cit's that was a very good reason to keep the anti-freeze mix strong-ish and fresh.
Re the thermostat, I'd say depends how simple it is to do, but if it's working fine and not too old I'd keep it as a spare and leave it for now...
The coolant has been changed by me few months ago, witch was bit of a mistake, because I've made the mixture in wrong proportions (bit more water than coolant). It didn'tīt get any rust, till now, but is best to change, before it gets me troubles, as is not strong enough.
Correct me if im wrong but i think you need your belts changing i think its 36000/3years which ever is sooner
I know, that's why I want look and see how they are, I'm getting to the edge in years, in km I still have 20000km to burn (not true I know). I hope they do one more year. Don't forget I'm posting in km's, 36000 miles make aprox 60000km's. This belt issue is kind of mice and cat game, we never know, maybe the mice lives or die. I've been whit a 147 whit 6 years 120000km's on the clock and the belts where never changed, lucky guy I think.
You won't get all old coolant out as there isn't a drain tap, etc. But most will be lost if you take the hoses off and more if you replace the thermostat. Not sure about Portugal, but rads tend to start to fail around 6-7 years old so that might be a necessary evil too. There's a how-to on changing the thermostat on a TS on my greenserpent website. Get new jubilee/hose clips as the old ones get wrecked.
Yes thatīs true the old coolant won't come totally out, 1L or more will stay there, I've checked that last time I change it. Back here rads don't use to give many troubles, unless people use plain water(very usual), get brokem by some small rock on the road or when they drink to much wine and ran the car throw a wall.
Already cheeked a how to change the thermo in this forum, think it's easy, sow I guess it will be changed. To make it even easier I bought a special plier just to handle whit the clip-r clips (also new standard ones, just in case), will be like a pro (or not).
Thank you all, for the replies