Right so had my rs about two month after a couple of weeks owning it temp was getting sky high in traffic and when stood stainonary.

Changed to a 82 degree stat and did temp sensor. Flushed water system with a hose pipe was still the same, anyway thought bugger it i ripped the head off and had a differant head skimmed etc. used a ford head gasket new water pump everything is new samco hoses etc.

Its been fine last time i was out in it, its been parked up 10 days went for a little potter about last night temp rose again to about 3/4 am I been paranoid im thinking of changing header tank cap does anyone know where I can get one and also could it be radiator.