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Bar's Leaks Liquid Aluminum Stop Leak seals radiator leaks. It also effectively seals freeze plug leaks, repairs gasket leaks, and addresses heater core leaks. Additionally, it helps in lowering water temperature, contributing to the overall health of your cooling system.

Devant view of Bar's Leaks Liquid Aluminum Cooling System Radiator Stop Leak.
Consignes de sécurité
CAUTION: SKIN & EYE IRRITANT. Read all instructions and cautions on the back panel before use.
Always protect the product from freezing. Store in a cool, dry place away from direct sunlight.
- Tenir hors de portée des enfants.
- Avoid contact with eyes. In case of eye contact, flush immediately with water for at least 15 minutes. Seek medical attention if irritation persists.
- Do not take internally. If swallowed, do not induce vomiting. Call a Poison Control Center or doctor immediately.
- After handling the product, wash hands thoroughly with soap and water.
For detailed safety data, please refer to the official Informations de sécurité (PDF).

Back of product bottle showing safety and usage instructions.
Pre-Installation Checklist (Setup)
- S'assurer que le moteur est froid : Before beginning the installation process, make sure your vehicle's engine is completely cool. This is crucial for safety and to prevent injury from hot coolant or steam.
- Localiser le bouchon du radiateur : Identify your vehicle's radiator cap. If you are unable to locate it, consult your vehicle's owner's manual. If direct access to the radiator cap is not possible, the product can be installed into the pressurized reservoir.
- Inspect Radiator Cleanliness: Look inside your radiator. No flushing or draining of the system is required unless the system is visibly dirty or contaminated. If the system is clean, you can proceed directly with installation.
Installation Instructions (Operating)
Follow these steps for proper installation of Bar's Leaks Liquid Aluminum Cooling System Radiator Stop Leak:
Official video demonstrating how to install Bar's Leaks Liquid Aluminum Cooling System Stop Leak.
- Shake Bottle: Shake the product bottle thoroughly before use to ensure the contents are well mixed.
- Bouchon ouvert : Carefully open the radiator cap (or pressurized reservoir cap) once the engine is cool.
- Pour Dosage: Pour the proper dosage of Bar's Leaks Liquid Aluminum into the radiator. A full bottle is typically used for 6, 8, and 10-cylinder engines. For 4-cylinder engines, use half a bottle.
- Remplacer le capuchon : Securely replace the radiator cap.
- Idle Vehicle: Start the vehicle and let it idle for approximately 15 to 20 minutes. This allows the product to circulate and work its way through the cooling system.
- Activate Heat and Fan: During the idling period, ensure your vehicle's fan is set to high and the heat is set to hot. This helps in circulating the product through the heater core.
- Assurer la ventilation : Always perform this process in a well-ventilated area. Ne pas do this in a closed garage due to exhaust fumes.

Bar's Leaks product ready for use in an engine bay.
Post-Installation & Maintenance
- Laisser le moteur refroidir : After the idling period, turn off the vehicle and allow the engine to cool completely before proceeding.
- Vérifier les niveaux de liquide : Once cool, remove the radiator cap and check the fluid levels in both the radiator and the overflow tank.
- Add Coolant (if necessary): If the fluid levels are low, add extra coolant to bring them up to the recommended level.
- Remplacer le capuchon : Securely replace the radiator cap.
- Surveiller les performances : Over the next couple of days, keep a close eye on your vehicle's temperature gauge and regularly check for any additional leaks to ensure the product has fully sealed the system.
Spécifications du produit
| Attribut | Détail |
|---|---|
| Matériel | Plastique |
| Volume de liquide | 16.9 onces liquides |
| Poids de l'article | 0.8 livre (environ 12.8 onces) |
| Formulaire d'article | Liquide |
| Numéro de modèle | 1186 |
| Code UPC | 046087011867 |
| Pays d'origine | USA |

Proudly Made in USA.
Garantie et assistance
Bar's Leaks Liquid Aluminum Stop Leak comes with a satisfaction guarantee. For specific details regarding the guarantee, please refer to the product packaging or contact Bar's Leaks customer support directly.
For additional questions, technical assistance, or to explore other products, please visit the official Bar's Leaks website or contact their dedicated customer service team. They are always available to help.
- Visit the Bar's Leaks Store on Amazon
- Télécharger le guide de l'utilisateur (PDF)
- Télécharger le manuel d'utilisation (PDF)

Bar's Leaks: Legendary performance formulas since 1921.