could be oil in the water if its white and milky not a good sign you should have it check.... has it been run hot if so its a good bet
When i open my radiator it look's like clay dirt what could this mean?
kind of a rusty look or red georgia clay right? contamination of the system. usually happens when mixing 2 diff types of coolant are used. systems using dextron(orange stuff) have this problem often. you need to have the cooling system flushed and replaced.