change coolant system
Hi Kappio! Look for your coolant overflow reservoir which will be on the end of a runner tube that runs from the top of you radiator. It's most likely white plastic. The black (most likely) cap will come off of that and when the engine is cool, you can fill it to the level that is marked on it's side. Good luck!
Search Volvo S70 Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Volvo S70 Experts