Originally Posted by The Grim Reaper
The orange in your coolant is not rust, if I remember from my mechanic course days, it's chemicals in the oil reacting with your antifreeze, head gasket is the most likely, I'm afraid. Anyway, the MGF has an aluminium block and rad, IIRC, where would rust come from? I can't think of anywhere.
Cheers
Grim
Ok Rust was thew wrong word then, Rust coloured, Tell me why then , when radiators do become blocked / cores degraded, rgardless of what engine casing type the water is always rust coloured & even that colour on cars that have not had head gasket problems only Radiator related ??
Are you sure it's an Alloy Block !!!
Dean