I'm amazed how similar your symptoms are to mine. 1997 GT2.5, 92Kmiles. The thing that kept me hoping it wasn't the head gasket was the fact that the compression readings (cold and "warm") were all equal (214 +/-2psi). But it sure enough bubbles and blows coolant out of the overflow tank. Also fails to suck it back from the O.T. on cooling. I'm trying to decide whether to pull the engine or try to do it in the car. If I could determine which head it was. But no coolant is getting into a cylinder, so I can't figure that out.
Have you fixed yours yet?
