age is only a number
AO Gold Member
Join Date: Aug 2004
To be honest its difficult to understand what is happening - I accept that you don't know anything about cars....but for it to lose water there is a problem that is more than a "switch".
If the thermostat has failed closed, then the car will warm up as usual but then overheat (but your heater should work fine) - when the engine is hot (as indicated by the temperature gauge) check the top hose from the engine to the radiator - if this is cold, then the thermostat has probably failed closed.
The thermostat is effectively a mechanical device..very rarely called a switch. The switch screwed into the thermostat is a temperature sender which amongst other things tells the radiator fans to activate - are your fans running when it gets hot?
There is always the chance that you have two unrelated problems - the water loss and consequent overheating which could be a number of things, including a radiator leaking, and the not starting when hot - which could be the well known crank sensor problem.
Really you need to get someone who knows Alfas to have a look at it, I'm afraid....
AROC Vice-Chairman and Lancashire Section Secretary
Alfa organ donor to the gentry......