honda overheating

Hi, We’ve a 2008, 2.0 (R20a) petrol CR-V with 190,000 on the clock. It’s overheating - the bottom hose is cold and the radiator is cold at the bottom too. The top hose is hot. I’ve: changed the thermostat (no difference) checked the old thermostat in hot water (it still worked) removed the new...