Where is your probe? It could be in the upper outlet from the head to the radiator, but is more commonly in the lower inlet to the block.
If in that lower position, it will take a lot more and longer work than you're giving it for it to register much on the gauge if at all. That thermosiphon is an amazingly effective system -- a lot of radiator and a LOT of fan on a small system. On mine, I have to cover the grille to get it it to even warm up on a short run. At the end of the run, it will be hot enough on the top tank of the radiator to be uncomfortable to touch. The bottom (Where your temp probe likely is) will be quite cool.
You can stick a thermometer in the filler neck to see how warm it is at the top aftr running a while. But warm at the top and cool at the bottom indicates a good cooling system. A thermosiphon uncomfortably warm at the bottom would be a sign of possible blockage or restricted flow.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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