brown
Standard with use!!!!!!!!!!!!!!Heat metal-expose to weather what color will it turn????
If you could stand the ride , under the hood when in use say 65 mph with water temp at say 190 deg ,dark night,no lights on,you would see why it is brown>>>>now gross out with a 20 k lb trailer /with the same out side lighting(none) a winter front still on the front end(cover for rad, supposed to be used only - 10 deg weather--- not still in place say + 10 deg) you have rendered the intercooler/after-cooler/air to air exchanger--what ever you want to call that thing'ie in front of the rad ,behind the a/c cond. in-op(abv. -for we dont need this) and why has melt down happened/blowen gskt??
There are cook books out there for an oem set up eng,that you can set raw food on the manifold and run for x-hrs /min(can of beans/corn beef hash ect) ready to eat!! even in the deep cold these parts get Hot!!!!
Turn up the fuel-shut(winter front + 10 deg at highway speeds) off the air/lack of coolant things get pink even without the rad cover ----then turn Brown!!