I have a 1999 GMC Jimmy SLT 4wd. The heater core seemed to go out as well as a leaking water pump a few months ago so I fixed the water pump and bypassed the heater core. The recent freeze hit and I thought I put antifreeze in the car but forgot people talked me out of adding the antifreeze until after I replace the heater core. Well the cold hit things froze and I tried to go to work and the car seemed to run rough and I thought it was in my head but I did let the car warm up some.
I got about 3 miles away and the car stalled out and would not restart but would try to start. I had the car towed back to the house and when the weather was warm enough. When I looked at the engine when it stalled out it did have frozen water in the radiator but no water at all after the weather warmed up. I put the water hose in the radiator and turned on the water and notices the water leaks out just as fast as I put it in from the bottom of the engine. I took the air breather off and watched it but the water seems to be coming from under the drivers side head block but im not 100% sure. Checked the oil and water was in the oil.
Reading and watching some videos leads me to believe I might be lucky and have a worn intake gasket but those videos show a clear leak from the top of the engine. It might be possible its leaking from the back of the engine running down and around and just falling from near the front bottom of the engine not to sure to many things in the way.
I cannot find a video of water leaking from a head block or much talk about water leaking from the heads. I know the Vortec 4.3 has a water channel but leaking this much water threw a head and under?
Any advise will help me figure this out.