[quote=BernardS]
The amount of heat lost by a car radiator by radiation is less than 1% of the heat it loses by forced convection. The reason they are painted black is because it’s the cheapest paint. Think of the Model T Ford. 
[/quote]
EXACTLY my point …
The colour matters not !
But if the extra 1% matters to you then go black…
Anyhow the majority of the worlds commercial radiators are still black has now’t to do with cheap model T Fords and their paint cost of 100 years ago!!
Glad you’re paying attention BernardS
