Last post on Apr 23, 2003 at 12:23 PM
You are in the Pickups - Archived Discussions
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GMC Sierra 2500, Engine, Truck
Mar 17, 2003 (7:33 pm)
Will changing to Prestone on my 2001 Sierra void the warranty?
#6 of 12 DEXCOOL COOLANT
Apr 06, 2003 (12:27 pm)
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
#7 of 12 intake gaskets
Apr 06, 2003 (4:18 pm)
My son recently replaced tke intake gasket on his 96 s-10 4.3. The truck was bought new by me in Sept. 96. The truck had 166,000 miles when it failed. Also it still has the original waterpump.It has never had anything but Dex-cool in it, and still does. The problem is with the composite manifold and the type of gasket with o
only about 15 inch pounds of torque. Mark
#8 of 12 Mark said it all
Apr 06, 2003 (8:14 pm)
its not a dexcool problem
Apr 08, 2003 (7:39 am)
I still trust my mechanic. He works on 'em everyday.
#10 of 12 There is a known problem with the gasket.
Apr 08, 2003 (11:06 am)
Basically Mark is right. There has been a TSB or two in the past referring to overtightening of the intake manifold, thus the resulting gasket leak.
A number of the mechanic's I have seen still try to bolt these intake's down by "feel" and fail to follow the manufacturer's guidelines. Most still try to torque the manifold in ft lbs not Inch lbs.
Apr 22, 2003 (3:13 am)
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.
Apr 23, 2003 (12:23 pm)
You can bet consumers will get the short end of the stick...just like the last suit for the gas tanks, a $ off voucher that you have to jump through hoops to get...my truck still has the original gas tank. But, to cease using the product would be to admit that there was a problem with it.