car over heats changed water pump and thermstat still overheats on 1990 BMW 325i

bubbles out of radiator and i see small air like bubbles

Asked by for the 1990 BMW 325i
1 answer
Why did you change the water pump and thermostat? I'm guessing because it overheated, right. Have the cooling system check for HYDROCARBONS. Suspect you have a blown head gasket.