I can see my under bonnet sticker , need to use paraflu 11. Car is year 2000 so has fiat replaced 11 with paraflu up red pink one? Or i should use 11 blue one.
You can use the blue coolant, or you can use the pink coolant, since your car was engineered for the blue one. However, I have never heard of any problems putting blue or pink in any car, regardless of its age.
You're also not supposed to mix the different types but a guy on the Alfa forum tried it and didn't have any problems. The biggest reason not to mix them seems to be that the result (a greeny brown) looks like vomit..
I would also suggest using a 50:50 mix, not 20:80 or any other variation. If you use less than 50%, your engine will corrode, albeit more slowly than if you use water alone. Any water causes corrosion.
But if you go above 50%, the glycol starts to lower the boiling point of the coolant. 50% boils at 113C (atmospheric) so is the best compromise between protection and boiling point.
Distilled water or not distilled water... If you're in a soft water area then regular tap water would do. If you're in a hard water area, then bottled water is better. If you have someone selling distilled water nearby, then distilled water is best.
If you have 50% antifreeze in your coolant, that suppresses the leaching of minerals out of the water... but minerals rarely become fatal on their own. You'll wear out your water pump and thermostat more quickly but otherwise it's not the biggest problem, if you have no antifreeze in there.
Ralf S.