Originally Posted by guttafixit
I put the K-SEAL in. Went 6 or 7 miles my temp gauge went up above half way and the only time it goes up there is when it goes to the red mark. When it half way it dropped down and hasn't gone beyond the mark above the quarter. The temp gauge only moves between 2 or 3 lines now. Before it was bouncing everywhere. I have all heat now. I do have to add some antifreeze since my light came on and off. It's from losing it before the K-0SEAL started to work. I REALLY hope this works on this van like it did on my Pontiac. If not I checked out how much it will cost me for parts. Under $300.00. Which I don't think is that bad. I'll post in a week or so and let you know if this K-SEAL is still working.
The head gasket isn't bad its the intake manifold gasket. Its made out of black plastic (the pieces you saw come out). Check in the Valley of the motor on both sides for coolant leaking out. it doesn't necessarily leak out of the engine, it will go into the intake about 50/50 of the time. This is the main issue with these motors not head gaskets. its not the worst job ever. If you want to keep the van get the upgraded metal replacement gasket set its quite worth it and will last the life of the car.
There are a few youtube videos of a gm 3.1/gm 3.4 (same motor different bore) intake manifold gasket replacement. You will really want to get a GM pushrod removal tool made by lisle for about $22. Carquest and other parts stores carry it.
its not a tough job, but you may have made a mistake with that goop ****, it typically causes more issues than anything because it will get caught up anywhere it is exposed to air in the system, not just where its leaking and can stop up the thermostat, radiator, water pump, and goop up all kinds of crap and eventually cause more cooling issues when the actual problem is resolved. Hopefully that's not the case.