9 out of 10 based on 124 ratings. 1,709 user reviews.

GM ENGINE COOLANT SUPPLEMENT SEALER

The users manual says "Use GM Engine Coolant Supplement (sealer) with any complete coolant flush and refill" It is used to prevent leaks due to casting porosity. The 4.9 has o-rings at the cylinder sleeves and it is used to stop leaking there. They can be purchased at the dealer or some auto parts stores,they are made by GM and Bars Leak
Coolant Tablets -Question - General Cadillac Forums
Was this helpful?People also askIs it safe to seal a blown head gasket?Is it safe to seal a blown head gasket?Sealant might not work well if the head gasket has extensive damage. Discolors some brands of antifreeze. A head gasket sealer that is compliant with ASTM standards and permanently seals the blown head gasket on all types of engines. The sealer is safe and easy to use.Best Head Gasket Sealers (Review & Buying Guide) in 2020See all results for this questionWhat coolant should I use in my Northstar?What coolant should I use in my Northstar?Fill the radiator halfway with GM Goodwrench DEX-COOL coolant. This is the manufacturer's recommended coolant; while other coolants can be used, they may increase the risk of overheating and damage to the Northstar engine. Drop three pellets of GM coolant supplement (sealant) P/N 3634621 into the radiator.How to Refill a Northstar Cooling System | It Still RunsSee all results for this questionAre head gasket sealers expensive?Are head gasket sealers expensive?Save money. Head gasket sealers are not as expensive as having the head gasket completely replaced. A replacement would require you to buy the head gasket, and you would also have to pay the automotive mechanic that handles the task. A head gasket sealer is an inexpensive option that provides a permanent solution,..Best Head Gasket Sealers (Review & Buying Guide) in 2020See all results for this questionHow much does a head gasket sealer cost?How much does a head gasket sealer cost?Under $20: This price range includes head gasket sealers that come in small containers weighing under 16 ounces. The content of these containers can help you handle leakages associated with the head gasket effectively, though you might have to get a bigger container for larger engines.Best Head Gasket Sealers (Review & Buying Guide) in 2020See all results for this questionFeedback
Genuine GM (12378255) Fluid 3634621 Cooling System Seal
General Motors ACDelco DEX-Cool Coolant Antifreeze - 12346290 OEM New 4.8 out of 5 stars 249. $21. Next. Compare with similar items. This item Genuine GM (12378255) Fluid 3634621 Cooling System Seal Tablet - 4 Grams, (Pack of 5) A must have inside any GM engine4.6/5(523)Price: $6
Amazon: Genuine GM Fluid 12378255 Cooling System Seal
K-SEAL Coolant Leak Repair, ST5501 8oz, Multi-Purpose Formula Stops Leaks in the Radiator, Head Gasket, Block, Water Pump Casing, Heater Core, and Freeze Plug - Pour and Go - Trade Trusted-Stop Leak 4.2 out of 5 stars 3,2404.4/5(95)Price: $7Brand: Genuine GM
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