hi and cheers to all,i'm a newbie in here.recently i got this one small problem wit my 94 laser,it's na 1.5l carb b5 engine and it's losing water.i've serviced the radiator,changed radiator cap,checked all hoses,waterjacket and all water lines,removed the thermostat,bleed the system.all fans are working and there is no water leaking.the engine temp still goes up if drive more than 120kmh.if maintain 80 - 100kmh temp maintain for sometime then it will go up.stop and check,water is missing.Could this be a gasket or head problem?please help.tq