vauxhall astra 95 radiator?

There will be an expansion tank/reservoir. There will be max/min marks on the plastic tank. Don't confuse it with the windscreen washer fluid reservoir. Nor with the brake fluid reservoir. Check it when cold. If the coolant inside is rusty, or clear (water), I'd drain and refill it with a fresh antifreeze coolant mixture.

Chicks Fan
July 2009