Thank you Luxobarge and ITSv40. As the thermostat is fine, I'll leave it and have the new OEM thermostat and sensor as a spare.
I thought something was not quite right as I started to fill with coolant. So far, I've added 2 litres of genuine Volvo coolant and 1 litre of de-ionised water. Waited for a few minutes to let the mix go down, but it stayed at the max level without dropping. I was expecting to be able to put the full 7 litres (capacity for a turbo system) of a 50/50 mix in straight away. I got her up to temperature after 10 minutes but the level didn't go down. At this point, I kept saying there's not enough coolant mix in. Went for a short drive and as you rightly said Luxobarge, the low coolant level light came on. Once home, I lifted the bonnet to cool the engine and could see the expansion tank was near empty. I'll fill it up again once the engine has cooled.
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