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Re: antifreeze
Many GM vehicles had stop leak pellets added to the cooling system at the factory and in the case of my 94 Caprice the factory service manual calls for the addition of two sealant pellets when refilling the coolant system. These pellets guickly turn Dex-Cool into sludge.
I flushed the cooling sytem in the manner Ketch described(had to pull knock sensors to clean out block) and refilled with Dex-Cool minus the pellets and am happy to report no problems, no sludge.
My question is why did GM put this heater core plugging crap in the cooling systems of new vehicles?
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