Deejay,

Think it might look orangey because the new coolant is shifting the deposits in the engine and they were red coloured from the OAT coolant. Mine didn't show a lot of sediment but just small deposit areas in two places in the header tank. As I said when I initially drained the old coolant out it looked perfect, right colour, perfectly clear. It was only through experience that I knew I must have some level of yuk within the cooling system to allow the deposits to reach the header tank. What surprised me was just how much muck the flush shifted when to all intense and purpose it would to most look like it was a clean system.


Dave.

Is your roadster running with the green antifreeze? It has a lot of silicates in it and its these that might be causing your deposits. Another thought is are you mixing your antifreeze with tap water. If you are in a hard waster area it might be calcium deposits.