I know i should know - but i dont! Vectra top up

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thescouselander wrote: »

I wouldn't assume there's no leak - you shouldn't need to top up the coolant at all as it is a closed system. If there is a leak the coolant might go down slowly. Its probably best to keep an eye on it for a few weeks to make sure its not going down.

This.

Also, apologies if you already know this, but do the check when the engine is cold, e.g. first thing in the morning or before you drive home after a day's work. It's a pressurised system and if you take the cap off after having been driving you'll get sprayed in the face with water that is close to boiling point.