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Discussion Starter · #1 ·
I've read about those little brown disks (biscuits) you can buy to try to stop leaking coolant, but I can't find any reference of its brand name in the forum. I looked for it at AutoZone, etc., but they don't seem to carry such a thing around here. If someone could tell me the brand I'd really appreciate it.
 

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You can use either GM suppliment #3634621 or Barsleak HDC, both are the same thing. If you're having a problem, it's usually the oil cooler on Cateras. The best thing to do is to have it repaired.
 
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