I have a big portion of my TB gasket exposed on the right side due to not having a bolt there but when I try to pull the gasket away from the intake manifold it still forms a seal so I thought it wouldnt leak. Yesterday I saw some fresh coolant on the tranny and was hoping it wasnt from the LIM gaskets which I just replaced so its obvious that its the TB right? There is nothing to do about this other than to get a new upper manifold because the bolt hole in the manifold for the exposed side of the TB is cracked but Im perfectly fine with that. Im getting a new one for Christmas along with my exhaust system but hopefully coolant isnt getting in the intake.

Have you put the GM sealant tabs (cooling system suppliment) in the radiator? They may seal it up or at very least slow it down. My TB gasket was leaking and when I put the sealant tabs in there it stopped. I though I was home free but about 6 months later is started again albeit very slowly. I finally decided to change the upper plenum and solved the problem once and for all.

In the future, please don't ressurect topics that are a year old. Please start a new topic.