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12378255 - GM/AC Delco Cooling System Seal Tablets Contains Five 4 Gram Tablets

This product may require vehicle validation(s) for proper fitment. Please contact us to confirm correct vehicle fitment and usage.

Pricing: $2.50


Original organic formula designed for use in cooling systems to seal leaks and prevent leaks due to casting porosity in engine components.

  • Seals minor leaks and porosity in cooling systems
  • DEX-Cool compatible
  • Non-Toxic


4 and 6 cylinder engines: 20 grams of material - (5 pellets of 12378254 or 2 pellets of 3634621)

Cadillac Northstar: 30 grams of material (7 pellets of 12378254 or 3 pellets of 3634621)

Cadillac 4.1L, 4.5L, 4.9L : 60 grams of material (15 pellets of 12378254 or 6 pellets of 3634621)

Application List


Shipping Information

  • Item Requires Shipping
  • 0.2 lbs.
  • W3.8000” x H3.8000” x L6.0000”

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