I'll be looking forward to your solution. My A4 won't move my gauge unless I close the raw water inlet. It runs fine, and starts reliably. It's raw water cooled (50 deg F year round).
When I bought the boat, the bypass had a restrictor installed, which I drilled out. I'm pretty sure the gauge is working, since I can put my hand on the block. I've stove-tested the thermostat several times.
I figure I'm getting poorer efficiency than I could, but it takes me a full year to go through one tankful, so it's no big deal...
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S/V Latis
Brookings, OR
Ranger 33
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