I've got an old one knocking about, the instructions say to run the engine for 10 minutes to warm the coolant up and ensure it's circulating.
Fairly sure I did this with the radiator cap loosened off (did it on a bike) so the cooling system didn't pressurise.
As you know if you take the cap off with a hot engine it's going to spit hot coolant everywhere.
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2009 Volvo V70 D5 (Polestar 225bhp) r-design 180,000 miles
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