Radiator stop leak is a specially formulated compound made up of small particles designed to accumulate at the source of a leak in order to prevent it from continuing. Stop leak is not a substitute for replacing a faulty radiator, but it can prolong the service life of a failing radiator until the radiator can be properly replaced. Stop leak is not intended for use in gasoline, motor oil or anything other than engine coolant.
Turn off the engine and apply the parking brake. Place the gear selector in park or first gear (manual transmission) and open the hood.
Place a rag over the coolant reservoir cap and slowly unscrew it. Set the cap aside. Place a rag over the radiator cap and unscrew it. Set the radiator cap aside.
Remove the cap on the bottle of radiator stop leak and pour the entire contents of the bottle directly into the radiator.
Replace the radiator and reservoir caps.
Drive the vehicle for 20 to 30 minutes. Park the vehicle and check the radiator for leaks.
