i have a 99 cougar 2.5 v6 with a blown head gasket, i was told it was the front bank, due to time and budget my dad says we are only going to replace the blown head gasket, i have been all over the internet trying to figure what head gasket typically blows on this engine, my dad says that with...

Ok i was driving and was being stupid and forgot to shift outta first and i blew a headgasket. there is oil in the coolant tank and is like blue and green color. I have no idea where the headgasket is or how to flush the coolant tank. WHAT DO I DO???