my car also sounds like rushing bubbles under the dash, but no mildew odor nor heat spikes. I was told that it has something to do with the hoses for the heater or something like that. there's two pipes at the back of the engine, one on the left, and another on the right, one has to be plugged can't remember which one.
I do have another problem with the cooling system, I sometimes build up pressure inside the water system? but the head gasket seems to be in mint condition.....
Who knows..... old cars gotta love them
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