Thanks for your encouragement and advice. I would like to say I have never been wrong and will never be again but I don't think I could live up to it. I see this is your first registerd post, so welcome.
Yes, this is his first post as this individual but now he has gone to other post of yours and trying to stir things up. I think his motive is rather transparent and worth ignoring.
I learned two things the fist week that I owned my 1500D. 1) The orange light is the temperature light warning you that the radiators is about to blow and 2) A thermosiphon system will not function on pure anti-freeze. There should be no more than 40% anti-freeze to water to make it circulate adequately to cool the engine.