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Dumb question, but the 968 system is reverse flow right ? ie water pump pumps to the lower hose and engine gets cool, coolant from the upper.
The only reason I can't convince myself that this is a head gasket problem is that I had a similar but not a bad difficulty about a year ago. System finally bled itself and worked fine until now.
If I feel up inside the water pump to the little rubber seal the block off on the end of the thermostat seats against the edges of it feel roungh. Not pitted or with chunks missing, just rough. Could not getting a perfect seal here cause my problem??
Thanks,
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