I have heard that it is common for auto manufacturers to use cooling system sealers on newly assembled engines cooling system. Is this so?
Yes! Many GM cars come from the factory with cooling system sealers.They are used to guard against porosity seepage, to keep the facing of the water pump seal clean and to seal any minor leak that may accrue. Apellet type of sealer is used which dissolves in 5-10 minutes, becoming a fine powder that disperses through the coolant system. The sealer will pass through a .024-inch sieve to prevent blockage of the small tubes in many heater cores. Chrysler and Ford have been using such pellets too.One company that supplies the sealer(Bar's Leaks) is Bar's Products.
