Bar's Leaks® Head Seal Blown Head Gasket Repair is the fastest, safest way to solve your vehicle's coolant-related head gasket issues. Your vehicle is a good candidate for this solution if it can idle for 15 minutes without overheating or having to add coolant. Use with ALL types of 50-50 mix coolant including yellow, orange, pink, red, blue and green silicate based & non-silicate based (OAT / HOAT) antifreeze, and/or water. Unlike other products, no draining or thermostat removal is required. Works with ALL gasoline and diesel engines. This also is the best additive to use in all racing applications. This professional-strength sealant penetrates leaking, blown or damaged head gasket area drying to form a seal actually stronger than the original head gasket itself. It's engineered with the strongest formula available to stop all other coolant leaks in plastic, cast iron, copper and aluminum radiators, heater cores, freeze plugs, gaskets, intake manifolds, cylinder heads and engine blocks. It also contains Xtreme Cool, a specialized additive that stops overheating and reduces water temperature.

  • Repairs blown head and intake gasket leaks
  • Seals cracked cylinder heads and blocks
  • Stops heater core and radiator leaks
  • Fixes leaking freeze and core plugs

DIRECTIONS (Note: Protect from freezing.)

  1. Install only in a cold engine. Shake bottle well. Remove radiator cap and pour the correct amount of product in per the dosage chart. Fill radiator and reservoir / overflow tank to proper level and reinstall radiator cap. TIP: Radiator cap may be on top of radiator, on engine, mounted on a hose, or a screw cap on the pressurized reservoir overflow tank.
  2. Turn heater on hot and fan on high. Run engine until thermostat opens or normal operating temperature is reached. Turn vehicle off and allow engine to cool. This may take up to 30 minutes or longer.
  3. Top off radiator (add coolant as needed) and either run engine at high idle (approximately 1200 RPM’s for vehicles with a tachometer) or gently drive for 15 minutes. Turn vehicle off and allow engine to cool.
  4. Top off radiator and leave Bar’s Leaks Head Seal Blown Head Gasket Repair in system for continued protection. Drive vehicle as normal. Most leaks seal instantly, but some can take additional thermocycles which happen over a few days of usage.