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Been there...
I had a very similar problem with our A-4 (running on Lake Michigan, where the water is COLD in the spring).
My A-4 ran around 180 until I rebuilt my water pump. Then some funny things happened, the engine ran MUCH cooler (around 125) until one day it never warmed up at all.
It turned out that two things were going on, the first was a piece of water pump impeller from who knows how long ago was dislodged and partially blocked the by-pass. This helped a lot, but the engine still ran a little cool.
However, when I next adjusted the mixture and the timing the engine temperature came up to 140 degrees and has stayed there ever since.
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