intake gasket gm
Not long ago I posted something about this problem. I deliver mail to a repair shop for about 20 years and I saw a 99 silverado with the top of the engine off. I asked what was the problem and they said the dex-cool ate away the intake gasket. He advised me to drain and flush the dex-cool from my 01 Sierra [5.3] and replace it with good old Prestone.
GM knows they have a problem with Dexcool but they are not willing to correct this problem by going back the green coolant that did not have any problems, & when the Dexcool eats away the intake or water pump gaskets allowing the cooling system to leak coolant & get low it will start caking up in the cooling system. Jtt3 per Gm dexcool is not due to be serviced until every 100k, I have look at some vehicle at 30k & the dexcool already looks really dirty, I would recommend having the cooling system completely flushed & have green coolant put in the vehicle, unless you like buying intake & water pump gaskets.
Intake and exhaust manifold problems have plagued the GM big blocks for some time. The exhaust manifolds get so hot that they warp and have to be resurfaced. The intake manifold problem is present with either the red or green coolants. However there seems to be a problem with dexcool. GM has launched a suit against Dupont over that product and the costs that GM has incurred dealing with their use of the product. Both parties are now negotiating what will happen. Interestingly, GM is still using the product in their vehicle line today.
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