Just so you know, if starting from cold it's normal that the bottom hose remains cold while the others heat it. It means the thermostat is doing it's job! When the water temp gets up to about 85c the bottom hose will start to warm up meaning the thermostat is starting to open. Don't go by the dash gauge, it's not very accurate as it reads temps of water in the cylinder head not at the water pump/thermostat area. I mean, it's accurate, but only for cylinder head.
