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Fix the leak, and fill the coolant.
You need to identify the leak before you can fix it.
To fix sunroof in a 200 Oldsmobile Aurora, first detect where the leak is coming from. Apply marine sealant to the affected area and let dry completely.
Replace the drain plug gasket and don't over tighten it.
IF THE LEAK IS FROM THE RADIATOR, THERE IS NO FIX EXCEPT TRY THE RADIATOR STOP LEAK CANS OF FIX....IF THAT DON'T WORK, GET A NEW RADIATOR. THAT'S ALL YOU CAN DO!!!!!!!!!!!
Replace the master cylinder.
We are going to need to know where the source of the leak is to help you with that question.
Stop leak will generally plug up holes u want plugged, but they will also plug up holes u don't want plugged. Better to fix the heater core.
Find the leak source and repair it. Usually the cause is cooler hoses.
it could be an exhaust leak, a bad plug wire, loose spark plug or a lifter. check the oil.
Un plug the drain which is on the firewall behind the right front tire.
You could try, but it will be a temporary fix at best and could plug up the heater core or radiator at the worst.