GUS on the GM coolant sealing tabs/pellets

Discussion in 'Domestics' started by crunch, Jul 1, 2007.

  1. crunch

    crunch wrench

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    Does the GM service manual on 97 C/K Suburban and or pickups say anything about using the sealing tabs to prevent a water pump leak when a coolant system flush is done?
    And can you give us a rough list of what GM engines and cars they are required on when a coolant system service is done?
    Thanks Crunch
     
  2. Gus

    Gus wrench

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    Sealant is not generally an additive for a flush, by GM....although I have seen some procedures call for the use of tablets when replacing a water pump....

    However, have seen shops with aftermarket machines, that install a chemical flush, run the engine, and then flush with clean coolant, then they add a liquid sealant to the system....kind of a "package" deal.....
     
  3. Transman

    Transman Receptionist & Complaint Dept.

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    Add here... It also comes from the fact that for a long time GM used pellets right at the assembly plant as normal. $.02 , Transman
     
  4. crunch

    crunch wrench

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    Thanks for the info Gus and Transman.

    But I was trying to confirm this.

    Or if it is in any other GM repair manuals.

    I'm troubled by what caught my eye in the 1997 C/K truck service manual Book 1 of 2 (no publication information, it appears to have been printed for the Service Technology Group of General Motors and was purchased through a dealer).

    In the Cooling and Radiator section, page 6B-15:

    "NOTICE: Two sealant pellets GMSPO P/N 3634621 must be added to the radiator whenever the coolant system is drained and refilled with fresh coolant. Failure to use the correct sealant pellets may result in premature water pump leakage. Do not add pellets to the coolant recovery bottle since this may prevent coolant system from operating properly."
     
  5. Jim Fairbanks

    Jim Fairbanks wrench

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    Hey Crunch...Alldata says to use the tabs when refilling...Here is what it says......Jim.........
    Refilling
    Notes

    WARNING: As long as there is pressure in the cooling system, the temperature can be considerably higher than the boiling temperature of the solution in the radiator, without causing the solution to boil. Removal of the radiator cap while the engine is hot and the pressure is high will cause the solution to boil instantaneously and possibly with explosive force, spewing the solution over the engine, fenders, and person removing the cap. Under some conditions, the engine coolant is combustible.

    CAUTION:


    When adding coolant, the manufacture recommends that you use GM Goodwrench DEX-COOL coolant If coolant other than DEX-COOL Is added to the system the engine coolant will require change sooner - at 50, 000km (30,000 miles) or 24 months.
    Two sealant pellets GM P/N 3634621, or equivalent must be added to the radiator whenever the coolant system Is drained and refilled with fresh coolant. Failure to use the correct sealant pellets may result In premature water pump leakage. Do not add the pellets to the coolant recovery bottle since this may prevent the coolant system from operating properly.
    Check the radiator drain cock to be sure that it is closed.
    Check the engine drain plug to be sure that it is tight.
    Premix the antifreeze with clear water (distilled water preferred) in a 50/50 ratio.
    If the old coolant is being used, check it for 50/50 glycol/water mix and make sure that it is clean and clear.
    Place a large top funnel in the radiator fill hole.
    Slowly pour in the coolant. Refer to "Specifications" in this section for the cooling system capacity. The filling may be slowed because of the thermostat being closed.
    After the cooling system is filled to 13 mm (1/2 inch) below the fill hole, start the engine and let the cooling system warm up. When the thermostat opens, the coolant level may drop. If the level drops, add coolant until the level is up to the fill hole.
    Replace the radiator cap.
    Check the coolant level in the recovery reservoir. Add coolant if needed.
     
  6. crunch

    crunch wrench

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    Thanks for the info Jim.
    Good info on it being combustable. :)

    Do you know if that is just a one year deal or does it cover several or all years?
    Crunch
     
  7. Jim Fairbanks

    Jim Fairbanks wrench

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    I looked in there for 96 and 98 and a few other years and even looked under s10 and some of the other ones and didn't see anything......just that year and model....Jim
     
  8. crunch

    crunch wrench

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    Thanks JIM.
     
  9. Jim Fairbanks

    Jim Fairbanks wrench

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