The temperature of the radiator hose appears normal then, so your thermostat sounds as if its working okay. If the hose was piping hot to the point where you couldn't touch it, then I'd say your thermostat was dodgy.
It sounds to me like your coolant is old if it has no colour to it as such. My car has a green/blue coolant in the reservoir, but a Volvo specialist changed mine for me. If you're doing it yourself, nip to a dealership & buy genuine Volvo coolant. Its made for the car & then you have no issue of mixing an aftermarket brand with what's already in it.
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2007 S80 2.4 D5 - 110,000 miles
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