new to the site and im hoping somebody can help me out. as i am a ford man by career, my wife loves her grand prix. great car, not a complaint.. until it started to get cold this season and we noticed the temp is NOT rising like it should at ALL. checked the the overflow and its where it should be, popped the cap off the radiator, and found nasty brown sludge.. dealer she bought it from changed the oil for her for free every 3000 and has never said there was coolant in the oil, so im out of ideas. coudl this still be the head gasket? if so how hard is it to do myself? i dont know squat about these motors. theres no blue oval anywhere
