So many people below asking how to change Alto radiator fluid, this thread also comes on top of google search. So I will post link to a video here, this guy is changing coolant of ALTO 1000cc car, he flushes and properly cleans radiator all by himself, and also uses proper coolant + gives all sorts of tips and tricks which will help you everyone. So here is the video.
How to clean, flush, and change radiator fluid ALTO VXR
