Prestone® Products AS145Y Radiator Stop Leak, 11 Oz

Prestone® Radiator Stop Leak’s patented formula quickly stops leaks in radiators, water pumps and heater cores while also protecting against pitting and corrosion. Unique combination of natural & synthetic components provides the ability to seal leaks up to 0.016" x 0.5". What makes this possible is the size, strength, & durability afforded by fibrous particles, the same materials in bulletproof vests.

• Unique combination of natural & synthetic components provides the ability to seal leaks up to 0.016" x 0.5"
• What makes this possible is the size, strength, & durability afforded by fibrous particles, the same materials in bulletproof vests
• Seals even large leaks without interfering with the flow through the radiator & heater core tubes
• Boosts corrosion inhibitors to protect against pitting & corrosion, which cause radiator leaks
• With engine off and cool, shake well and add entire contents to radiator and fill with Prestone® 50/50 Antifreeze/Coolant. For systems larger than 12 quarts, use two bottles
• Run engine at the highest heater setting for 10 minutes after reaching normal operating temperature
• Turn off, allow to cool. Fill with Prestone 50/50 Antifreeze/Coolant. Check fluid frequently, top off as necessary
• Do not use in a dirty or partially clogged radiator. Use Prestone® Flush + Cleaner first.

Free shipping on orders over $35.

Not shipped to AK, AS, AE, AA, AP, GU, HI, PR, VI.

Returns accepted within 30 days by mail. Return shipping is paid by the customer. See our refund policy.