On a 2000 Saturn you should probably replace whatever part is leaking rather than gum it up with a sealant.
If you must use a sealant you would remove the pressurized radiator cap.(This cap may not be on the radiator on all models. It may be located on a plastic surge tank located separate from the radiator.) Once the engine has reached full operating temperature add the sealant in to the rest of the coolant. Top off the coolant and replace cap. Run engine or drive for 10 minutes. Then shut the car off and allow to cool completely.
NOTE:Radiator sealants will not stop leaks of rotating shaft seals(water pumps). Additionally, modern engines such as the ones used in Saturns have tight engine clearances and small water passages through aluminum parts. Sealants are a safe bet to use on the over-sized cast iron engines of days of yore, but a modern engine is isn't made for that kind of gunk surging through its veins.
You add it to the overflow tank which is on the drivers side fender.
Saturn radiators don't have caps to check and add fluid to the radiator you open the overflow tank and add it there
**I meant to add that the radiator cap is not to be found on this vehicle. Can it go into the coolant fill tank?
No, shake bottle of sealant well - pour directly into radiator and run engine for approx 15-20 minutes so it can seal properly in the system.
no cap, just the coolant tank, add to this to add coolant../
If Im not mistaken, the Pressure cap for a Saturn is the twist on cap on top of the coolant resovoir, if the cap say under pressure then that is it and to add coolant to radiator you fill it thru the res.
You do not need to add a sealant to the gasket. Just make sure you torque the bolts to factory specs.
It will draw it in from the overflow tank when it is needed. Fill that up to the proper line.
Remove the radiator cap and add it directly to the radiator. Then fill the overflow reservoir to the full mark.
add it to the oil.
Any stop leak additive is always a bad idea. If you do add it, make sure the fluid level is correct when done.
There is no cap for the radiator. To add anti-freeze to your radiator you have to fill it from the overflow. To find that trace a small rubber hose from the top of the radiator to what should be a plastic container