Hi,
The anti-freeze in my 3yr old Aveo still looks good. No sign of sediment deposit or sludge is seen when I replace the water pump. I refilled the system with Dexcool, same as the original coolant. I heard that Dexcool is not good as compared to the green or yellow kinds. Should I flush the system and fill it with the green or yellow coolant? If so, do you know how I can do it properly? Thanks.