Originally Posted by Kimberly
Plastic gaskets? What idiot came up with that idea?. OK guys, you have me convinced; I am taking the UIM and LIM off the car and getting what is needed to fix this job properly. It should have been done the first time by the previous owners; they decided to cut corners. I am surprised they did not ruin this engine as it was loaned out to two family members to drive when their vehicles were down and all the time it had this coolant leak.
I will put the tractor back together enough to pull it out of the shed; I can cover it with a tarp, and the 98 Buick is going in to be fixed properly.
Thanks for the help everyone; this board is a valuable tool for GM owners.
Technically the plastic (nylon 6,6) is supposed to be able to handle the temperatures that it is exposed to in our LIM Gaskets, it is 30% glass fiber reinforced, and its short term heat tolerance if 355F, the long term is 170F, of course that does not mean over the years the gaskets won't become brittle, and break up from all of the heat cycling.
Some say the 2-EHA in the Dex Cool is somewhat responsible, as it is a known plasticizer, but I do not totally believe that as it is really only a plasticizer when it is used in the manufacturing process of some plastics.
I have ran DexCool for the life of my car, and have never had an issue, of course I service my coolant regularly, and I always make sure there is no air left trapped in the system.
Nylon 6/6 Specification Data