>to tell u the truth, i have seen white residue like creamy stuff in the coolant (in the round holder) dont >knw if u call that the expansion tank. >I've had problem with the coolant also, been losing coolant very slowly, its visible slowly on the pipes, >whitey when dried.. I'm not sure what creamy stuff in the coolant means but generally in the case of a head gasket leak I would look for creamy residue in the oil - for example on the bottom of the oil filler cap, and check to see if the coolant feels oily and smells of oil (remembering to let the car cool down thoroughly first t