Click on image to zoom

3634621 - GM Cooling System Seal Tabs- For Cadillac Aluminum Engines & Other GM Iron & Aluminum Engines

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

Availability: replaced by part number 12378255


Organic formula designed for use in cooling system to seal leaks and prevent leaks due to porosity in engine castings.

Compatible with Dex-Cool

For use in :
1999-Current Cadillac Northstar V8- 3 Tablets
1982-1994 Cadillac 4.1L,4.5L,4.9L - 3 Tablets

Small Block Chevy- 3 Tablets
Big Block Chevy- 4 Tablets
4 & 6 Cyl. - 2 Tablets.

Note. Tablets should be thoroughly
crushed and mixed with coolant or water and added to cooling system radiator.

Car should be run and mixture allowed to thoroughly circulate. Failure to crush tablets may result in a clogged radiator or heater core.

Application List



  • 3634621
  • 3634621
  • GM (General Motors)
  • replaced by part number 12378255
  • New


Shipping Information

  • Item Requires Shipping
  • 1.0 lbs.
  • W5.2000” x H0.8000” x L7.5000”


Customer Reviews

Comment Total Reviews (0)

Write the First Review!

You must login to post a review.

Trusted Specialists GM engine & parts specialists
Located in the USA Owned, operated, & employed
Need Assistance? Call us at 888-748-4655
Mon-Thu 8am-6pm EST
Fri 8am-5:30pm EST
Have a Question Email us and we'll get back to you within 24 hours
Pace B2B