Hello DCPAus,
Try pulling the water pump off. I did a complete cooling system overhaul(radiator,pipes,t/stat and pump)with factory radiator and pump.
The water pump was of concern to me as the bottom 1/4 of it and the galleys leading from it were blocked with a waxy pink crud. I cleaned it but have kept it as a spare.
It may be worth a check as I have never seen any thing like the crud that was on mine.
PS. My cooling system(TM2 fitted) has not leaked a drop since the overhaul. No top ups with coolant since the sytem has found its level and no temp spikes(not even on the hill going into Toowoomba, or the Tambourine Mountains hill...FIGJAM...woohoo )
Cheers,
Jason

