my sisters car is overheating at high revs
at idle it will sit there running for 40mins no problem. driving at low revs no problem, above 80kms it gets hot quick and pressure builds and overflows over flow.

thought it was a cooling prob or radiator issue.
radiator fella said it was a blown head gasket, but i cant see any evidence at all of water in oil.oil looks clean as new.

is it possible for all the above to be correct and it be a blown head gasket.??
have blown a few when i was younger and every time the oil was milky like coconut milk.

all the best
the fan comes on , think its hydrolic driven and runs at all times, sorry for lack of details
both radiator cap devices are new, its a toyota camry 1999 model at a guess. there is a radiator cap at the radiator(funny enuf) and there is a second one near the head. both are new and she was told she previously had the wrong ones fitted. the thermostat is located in the caps is this true ??