First, get a "Flush and Fill Kit" with cleaning additive in the auto dept at your local dept. store. Run the engine until it reaches normal operating temperature then shut it off. There is a small drain plug on the underside or back bottom of the radiator. It unscrews to drain the radiator but first carefully release pressure on the system by loosening then removing the radiator cap. Now remove that little drain plugand letit run out. Now follow the directions on theflush kit precisely. Not actually hard at all.
Your radiator is probably leaking transmission fluid into your coolant. Trans cooler is built into the radiator. Replace the radiator.
on the radiator
The radiator has a transmission cooling tank in it. Evidently the tank has cracked. You may have a crack in your radiator your transmission cooling line runnz in your radiator good luck
bottom of radiator
Remove plug or open petcock at the bottom or rear of the radiator or remove the lower radiator hose
How much does it cost to replace a radiator in a 2002 Pontiac Grand Am
It is on the bottom of the radiator on the drivers side.
Remove transmission oil pan Replace fluid, filter, and gasket
Changing a radiator in a 1997 Pontiac Grand Am can be a difficult task. To remove the radiator, all of the radiator hoses will need to be disconnected from the radiator. The transmission lines will also need to be removed. After all of the hoses are disconnected, remove all of the clips that are holding the radiator in place. Lift the radiator up and place with a new one. All the hoses and clips will need to be put back in place with the new radiator.
The 1991 Pontiac Grand Am radiator drain plug can be found on the bottom of the radiator. The radiator drain plug will be in the center of the radiator bottom.
The reason the fluid is a milky color is that water is getting into the transmission. How you ask??? Well the cooling lines go into the radiator to cool the fluid. It is at that spot it is picking up water as the cooler inside the radiator has a leak. the best solution would be to change the radiator. You could block the fitting ports for the lines at the radiator and put an external cooler on it. YOU MUST thoroughly flush the transmission and change the fluid and filter.
Should be at the bottom of the radiator logically...