Please tell me people. How the heater of the car does works? Is there any linkage between the radiator water and the function of heater? Secondly if already the coolant is added in the radiator, is it wise to add water in the white tank attached with the radiator. One more thing which is confusing me, on the inside of the bonnet, the instruction stickers says, “Don’t dilute the coolant or the life of the engine will be seriously shortened”. What does this implies. Only add coolant or water in the white tank. When should we replace coolant? There is no problem of heating in my car. Your opinion will be valuable for me.