I've got a slight issue with my car turning fresh coolant orange. I changed the coolant about 4 months ago when I had to replace a piece of the thermostat housing (which was pretty manky inside) and the coolant is orange again. Just curious as to what is causing it. I'm guessing its rust from somehwere but I'm not sure where. Radiator? Thermostat housing? Engine? Any help is appreciated!