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The upper hose should stay cool to your hand until the thermostat opens and the gauge will respond accordingly.
The bubbling sound behind the dash could be air in the heater core or system. I think it is rare but then that is only from my experience with my personal cars.
The engine coolant might be boiling in the block, just when the thermostat opens. Best thought is that the thermostat is hanging shut. Another thought is, it can get worse!
Just for reference, I like the Whaler Brand all brass thermostats as being best for staying accurate over the long haul. Use to be the standard issue, from Volvo and could be a dollar or two more if you can find them.
I think the last one I got, was from RPR out of S.F. You might have to shop around for them because the profit margin may not be as good.
As for the others, for me that is, those that hang on the display cards in stores can get tossed about. It becomes a scary proposition!
A real bad head gasket or crack head might cause extra pressure right away into the coolant bottle. I would check it right after starting up cold. Removing the cap and holding your hand down or stretch wrap over the bottle opening.
Think of these things as having a nice interrelationship moment. Maybe like, grabbing the cold hose is to a hand shake, on your first blind date! Wondering, if and when things will get better or worse?
Phil
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