If I get as far as the lower intake gasket and that's the issue, should I keep going and do the heads? The consensus is that they will eventually need replacement and I have 107k on the clock. However, I have been diligent about taking care of the engine, including flushing the coolant every 30k or so. So I find it hard to blame the dex-cool, so what else could have caused it? And since I don't have oil in the coolant, or vice versa and the truck still runs fine, it seems odd to me that the head gasket is leaking.

 

head gasket not leaking is odd.

 

I was prepared to do the heads until I found the problem on mine... I guess it depends on how much time you have available. I am planning on doing head gaskets on both of my trucks this winter.